Definitely start a second account, youre playing way too much on one account. I generally think if you exceed about 60 hours, go on another account. Use it as a warm up or as your main for a little bit since you seem pretty hard stuck rn.
Stats are generally great but I would give up flexing altogether, team comp doesnt really matter below immortal 2 imo as long as you have a competent smokes player you can win any round with any team comp. Your duelists have a super low win rate, and looking at some of your recent matches I see you're generally second entry as the other duelists always has more duels so instead of those duelists, just play more chamber. Really suits your playstyle from what I see.
On the maps you have a negative win rate on, youre swapping around agents quite a lot. I'd recommend generally to have 2 picks on each map that youre super confident on and try to get those picks. If you cant, have 1 fallback agent that you can play but not as well. So pretty much every map, you can have chamber and KJ/Cypher (map dependant). For the third pick, it can be someone like Omen, Gekko, Jett as theyre all very flexible agents.
For weapons, I would try to OP a little bit more and maybe try use the stinger a little bit more but if that hurts your consistency with what youredoing now then dont, because your rounds look super solid to me.
Id also not recommend playong more than 3/4 games without a little break, this could be just a 15 minute walk around somewhere or watching youtube or something. Also try to avoid tilt queueing, super harmful to mental and from my own experience always results in loss streaks.
So definitely make a second account and most likely it will end up higher ranked than your current one, your stats are super solid and im kind of surprised youre hard stuck