I held this thinking I was going to come back, I’m not for comp. This is how I climbed easy, really easily. Its mei, she hands down climbed me from bronze to silver before she went down for whatever reason. Won a ton of games in a row.
Run mei with rein preferably, other tank will always try to push on Defense or offense. Wall the enemy tank off and beat him up with rein (or vis versa) its auto win after that.
Dumbest strat but it worked really well, hope it helps someone else.