i am not sure how i can get a higher ammount of wins compared to loses anymore

i have been playing for 6 years now, i have had my fair share of permabans due to toxicity. I'm just lost in words for how much league changed since season 3. Its become harder and harder to actually manage and hold the game. Mistakes are more often punished nowdays and recovering from a setback is nigh impossible in the elo i am stuck in for the past 6 years Someone, give me some tips on how to improve. (I feel like i am some kind of challenger player now asking to newbies for advice)
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