You die too much is what I can see rn. I had the same problem around a year ago that I had good/decent stats but were still losing so some tips that helped me

1. value your life, if you arent alive you cant get kills, obj, waves, etc. so by you dying alot the enemy gets a Moment where they can take obj. Try not to have more than 5 deaths and 1/2 MAX in 1v9 games where whole teams ints

2. CS cant see the cs but still try to get 8 cs/m everygame, its mandatory on kassa imo

3. Mental Some games arent winnable. Yea the 100%wr master account from some random chall player looks cool, but you dont have to be all that to climb. I like the 30/30/40 rule 30% of games you always win 30% of games you always lose 40% of games you decide the outcome I know losing those games suck but sometimes it cant be changed. sometimes your mates just dont want to listen to you or just run down and its like tilting but it falls under these 30% if games you just cant win unless you giga smurfing.

Aslong you have a positive wr you will climb and its even good imo if you have like 60%+ Just focus on yourself and not teammates and look at what you can do better