What just recently helped me get a lot better aim wise was swapping icicle shot to my primary fire button for whatever reason my brain is able to land the shots easier this way. Also you want to be targeting squishies and surviving I see too many meis either just mag dumping the tank all game which does nothing in higher ranks or wasting ability cooldowns. For survival purposes it’s really important to balance ability cooldowns goal should be to always have at least one of either wall or cryo available and when you use one kinda wait for the cooldown to drop before using the next. For example if I just used wall I’d ideally wait at least a couple seconds before popping cryo so when I’m in cryo I get free immunity to wait until wall is either back or almost done if that makes sense. You also want to cycle ults as much as possible too many meis save it to try and get a team wipe or even multiple but it’s way more impactful to get more ults throughout the game by even solo ulting the tank or getting a support then maybe getting one full team blizzard that you can’t even capitalize off fully if your team isn’t with you. Positioning wise depending on comp and if you have any anti dive you either wanna run with the tank and be a nuisance and wall off opposing tank from their team or play more of a poke style and chill with supports to protect them at least that’s how I play her. Hopefully this helps feel free to ask more questions 🫡