Quest Res Albatross Priest - rank 5 easy ;-)
He wants to get past Rank 5 .
Even with a sub50% wr everyone will eventually get to 5 . That’s the easy part.
I usually only play Paladin, but this season I played like 12 games or so . The only advice I can give to OP , would be to stick with one deck ( for me it would be Warrior over Warlock) . The learning experience generally helps more than switching nonstop to counter a metadeck.