If you want a genuine advice - play Demon Hunter or Face Hunter. The decks are dumb as shit and give you 0 fun, but they have two pros: High winrate, short games. In conclusion they are the best decks to climb (some would also consider Murloc Paladin). I personally had an unwritten rule that I will not play DH untill I get to legend, but I had a similiar situation like you. I tried Rogue, Priest, Druid but I was stuck at Diamond 4. I picked up Tempo Demon Hunter and was in legend 1 hour later. Just a genuine advice.
If you want a genuine advice - play Demon Hunter or Face Hunter. The decks are dumb as shit and give you 0 fun, but they have two pros: High winrate, short games. In conclusion they are the best decks to climb (some would also consider Murloc Paladin). I personally had an unwritten rule that I will not play DH untill I get to legend, but I had a similiar situation like you. I tried Rogue, Priest, Druid but I was stuck at Diamond 4. I picked up Tempo Demon Hunter and was in legend 1 hour later. Just a genuine advice.
congrats buddy