I have found this to be helpful, NOT full proof at all.
So over on my main I played an S tier spec, loss after loss descending into MMR Hell where there is no return. So I swapped specs, had to relearn how to play it and all, new spec = fresh rating MMR.
I only accept queues that are a first time go, if someone declines on the other team that can be RMT boosters syncing queues to get their groups to line up. So I only accept first time queue pop goes. Reasoning is when the Premade boosters get their queues to line up, there you are at the top of the list, to get power farmed.
Frustrating because you want to play, and it can take a long time. But so far when I do 1st time goes, the majority are wins. 0-1600 in one day, and still rising. When I get impatient and just accept it, its Power farmed 0-3 by highly coordinated Multi Glad level players, over with fast.
Past midnight Americas time, after 2 losses in a row, I call it. After Midnight is daytime for certain servers, and thats when the game matches get truly SUS. Only play in primetime hours.
My one alt is in the 1700s CR, in 2kMMR groups, rising easy. Goal is to break 1800, get the moggies and call it done for the season. Need to see what the new Diablo 4 expansion is all about.
Disclaimer, I am not saying this will work for you, its just what I did and it seems to help with Blitz… I did this same thing in Dragonflight for Solo shuffle, and got multiple toons their 1800 moggies.
Maybe this will help someone, I dono, ty.
Until BLIZZARD comes to the rescue to help us all, we are on our own, hold outs behind enemy lines, DONT GIVE THE BOOSTERS ONE PENNY!!! lol