Naval Uptiers?

My 4.7 and 5.7 feel continually uptiered. Can’t compete.
I understand there is a method behind this? Could anyone link it as I really want to just play and have fun, if it means just logging in and staying in a spot to die for 30 odd matches, I’m good with that. I can work with WT in background.
Just need the method to get to equal tier playing.
Not be splattered in a 4.7 by a Graf Spee
Or a 5.7 against a Arkansas
Cheers for any advice (Not interested in downtiers)