Few ides wich can Grow HoST population:
1 st Hardcore new system mode almost same like Diablo 3 and heroes in WoW:
With limit deaths for an axample 0 -> 3 deaths . Hardcore stats dmgs,assists,heal,xp per every heroe,class… Penalty /Rewarded ranked points would be increased,win points eaither personaly!,depence from deaths. Hard part is you definte what exacltly should be numbers. For an axample xx games. Laddder /Rankto be like old one 2015 year.
In past time avarage 2 years or long ime i did suggested different rules. Again hardcore to death,death heroe or player would watch whole game to the end BUT depence from stats of heroe,game lvl,choosed talent builds would trasfferd buffed to the a life heroes/player or like this Brawl to the death. And these stats from death heroe would calulated and sapared on 3,4 a like heroes and pay attentione now…work in extra empty skills slots for main skill and heroic skils and trait and for
extra slots talents! That mean heroes would become hibrits heroes ,this not new idea ! This old idea is from Heroes of Newearth wich is completed befor long time ago. know is not something new idea(old like our world) 
Hard part is calcuated system and what exacly skills,heroic skills ,talents (from death heroe) to be saparated to a life heroes. Or that mean as you can guess,heroes would fragmented into pieces !. Difference from Heroes of The Newearth and HoTS is…in HoN was maked already replace skills and heroes become mixed or hibrits,but in HoST would be a lttle different!. So ?!
This idea is NOT worked befor in other genre DoTA games. Or that mean also
,heroes would become something similar like Diablo and WoW heroes skills ,but would be with more skills and talents and would be mixed/ buffed a little and or be learn extra skills,talents!. Or that mean heeoes become something similar like Cho Gall and Arbathur.! . And one questione …how many times you wanted to kick out from the game someone player because he is terrible or cant play so careful,i would ask you again HOW.MANY TIMES?! I can agree then come maybe more unbalanced skills,cds,dmgs,talents. And they must reworked again or do more balances changes . And indeed,then …for them(Blizzard team) would come more work. willSo ?!
2th New perosnal increased Ranked points system! :
they…
MUST THINK ABOUT TO INCREASE POINTS BASED OF THESE 20 ACHIEVEMETS FOR WIN GAME AND 200 POINTS WOULD BE SAME FOR LOSES GAMES.
THESE 20 ACHIEVEMENTS SHOULD BE GARDITIONE BY IMPORTANCE START FROM MVP SO…ON SO IN…AND POINTS WOULD BE DECREASED BY " -3" PER LEAGUE FROM BRONZE TO GRAND MASTER…WITH THIS WAY…CAN BE CLIMP UP A LITTLE BETTER AND OFFSET LOSES GAMES FROM BAD PLAYERS AND LUCK SITUACIONS AND THIS ALMOST 50 % WIN RATE.!!!
POINTS WOUl D BE MAX 265 FOR MVP AND BETWEEN 20 POINTS BASED OF THESE 20 ACHIEVEMENTS AND START BE LOWER PER EVERY LEAGUE.THESE 200 LOSES POINTS FOR EVERY LOSES GAMES CAN BE OFFSET WITH THESE INCRESED WIN RANKED POINTS.
FROM THESE 20 ACHIEVEMENTS 6 ARE MUCH MORE IMPORTANT!.IF ONE HIGH GAME XP-ED AND KNOW HOW DO NOT DIE OVER 5 TIMES…AND DO OFTEN SOME OF THEASE 6 IMPORTANT ACHIEVEMENTS…CAN A LITTLE CLIMP UP THROUTH THESE 5 DEVISIONS!!!
(Im sorry this copy and paste from old reply!! )
3 th Almost similar MMR system closet careful play lvls search system:
I did proposal different idea long time ago ( avarage 2 years ago),almost same like current lvls like heroes and account lvls,but would be bassed of KDA( kill,death,assists) ratio and to be calculated per every 7 days ,Lvls would be 5.XP can get and collected and calculated from after every complete end game. Every such lvl would be with with 1000 xp ( like now current devisons points). Wait the min,i must remind what exactly was mine idea. There was something calculated death ratio % after every completed end game.hmmm…I cant right remeber what exactly was.Then you can understand me very well. And depence from player lvl, MM system would search same lvls.Maybe you would ask me " Why would be colleted and calculated per every 7 days" ,right?!
Because our human qualityes ,emoties,condtions are different comstatly depence from our real life things.
Whole idea is when lose 200 rank points is …to offest this lose game !
From Bronze to Grand Master start from 3 win games agains agains vs 1 lose game
And this system table increase per every league 3,4,5,6,7,8,9(Second versione : 2,3,4,5,6,7,8 won games) won games vs 1 lose game s. Increasd earn ranked points!.
(again is copy and paste from my old reply! : )
4 th Ranked quests:
Hi…so…long time ago 2 years avarage i did suggest such Ranked,Unkared quests.
For every class and depence from heroes…
Like to 10 lvl or different requiements to 15, 20 in game lvl or so on ,so … or in 10 mins, 15 mins,20 game mins make xxx number dmgs,assits,xp,heal,soak for 100 ,200,300 wins games ,based like almost same these MMR 20 achievements…(MVP,high % heal so on…so on…)for an axample and make awesome rewards system like as you know mounths,skins,boots xp,gold or shards. But must be make it so hard for achievement.Because …of course payement dor skins,mouths,budies must stay and you continue earn money. you still have to make money … it does not matter that it’s free to play. I know its so hard to be define what exactly to be…because need so long time and colled data from player base. Such Ranked ,Unranked quests can a little help of players to improve himselfs.
(Copy and paste from mine old topic in US forum !)
And more ideas wich i not want right now copy and paste:)
This guy creator of this topic Kith,suggest almost bullsh.ts .Im sorry dude…but for me that is real true… try dont feel huff !
I live in Bulgaria ,im 44 old ,over 20 years gamer xp-ed,played so many games! Played from open beta!