Imo once you hit 4500 always just use lfg to put together a team of people close to your skill to grind out the rest with. When you get on a losing streak just stop, walk away and come back 30-60mins later and try again refreshed instead of staying there and getting mad. If you have life advantage use it. I noticed a couple nights ago when I tried to help some not so good pvpers in survival that despite being literally about to win because we have 1 life and the enemy has none left people will constantly ape in and die, losing the life advantage and soon later the whole round. That's about all I can think of rn so Goodluck
"Your the best, around! NO ONE'S GONNE EVER TAKE YOU DOWN!"