MI345MMM, here's an example for you...
https://wotinspector.com/replays/view/b6aeb4b865b28ce1c109232c708ea77b
In this game, I'm tier vii against tier viii, I finish in top 3, get a 2nd class mastery in the AMX 13 57 GF, which is armoured with paper! I was helped by the fail-toon (tier vii+vi), the red one got what they deserved, in my book the only reason for doing them is to try and get more games as top tier, I'm happy to join in whining about platoons 
I'm not a very good player and according to several of the trolls here I am a truly terrible player, so...
If I can do it, you can, I admit my 1st 5k battles were shocking and my stats will never recover, it took me another 10k games to get average, I'm a slow learner, it took me a long time to realise it was ME that was the problem not the game!
Join a different clan that does mentoring training like the FTC/B-B-B ones, watch videos, listen to players better than you, platoon with a better player if you get a chance and play lower tiers until you win more than you lose before moving up, then you may have a chance.
Otherwise you will never git gud and carry hard 
HTH