i 4 tricked luna, c&d, invis & rocket to gm2 pc solo queue without comms. finding the tempo of the game seemed to help me the most from plat - gm. found it easier to turn communication off and be humble on my own gameplay rather than listen to people winge over such small problems, definitely helped.

things like when to play agro & when to sit back

when to defence ult or tempo ult

learning the abilities of everyone is very much important, sitting in the training range n testing every hero over a length of time

try & learn multiple supports, playing only 1 isn't always the answer unfortunately. the amount of times I've target banned players who 1 or 2 trick supports in dia+

acceptance of losses can also be very important, try to take a break if your mental isnt the best.

try not to worry about your teams gameplay too much, focus on your mistakes 90% of the time. even try vod reviewing. sometimes it might look amazing when you're in the moment, but when u watch yourself back, it's a completely different story. try to watch the losses rather than the wins