Nothing you can do to the mechanics of the game.
The hardest Boss of the game cant be killed in Solo. There is no other way around on that mechanics. You really have to group up.
The hardest Bosses on Mythic Raid requires 20 players raid. But before you face them, there are easier Bosses where you would need gear from. But these Bosses require a group too. Either you group up with 5-man dungeons thru M+ or you group up with 10 to 20 players raid thru Normal or Heroic Raid.
Blizz will never make a Solo content that has equal rewards as Mythic Raiding. Becoz they can never make a Solo content as same difficulty as Mythic Raiding.
How could Solo be equal to Group Raid? It cant.
Here’s the general mechanics of WoW:
Solo - leveling, Open PvE World, Catch Up Area like Korthia or Zereth Mortis
Dungeons - Mobs and Bosses that cant be killed by Solo. It needs 5 people to beat it.
Raid - Mobs and Bosses that cant be killed by 5 people. It needs 10 people and up to beat it.
WoW is designed around this… from the very start since 2004 18 years ago. It wont change believe me. Been playing WoW since 2004 and I still play this game although I am way more Casual now unlike before when I was a hardcore no-life WoW addict back then. Dungeons and Raid kept me subscribing this game. I just love it.
I am surprised on someone who played WoW for 18 years without playing dungeons, raid or PvP. That is boring as hell to me. But you do you. It’s not my money. And no… Solo cant have Mythic Raid quality loots. Keep on dreaming … 18 years now and that dream hasnt come true. Go on, keep on dreaming.
BTW, Horrific Vision is the best solo that rewarded decent loots… in par with M+15 and Heroic Raid loots. Torghast cant do the same becoz Torghast can easily be beaten AS A GROUP.
I am not sure why Horrific Vision was not popular with grouping back then. I grouped up with a stranger then. That whole run was a catastrophe. I just want to kick him the whole time but I didnt. He kept doing something that is a no-no. Wasted my time reviving him as he keeps on dying. I should have leave him dead and I could still time it by myself.