My advice would be to play what you know
It looks like you just pick random champs (new kat, talon, illaoi, etc). These are all moderately difficult to play.
It looks like you main jungle and mid. I saw a number of Kindred, Xinzhao games and mid Ziggs, Kat, and some others. Your kinda all over the place.
I think the best way to improve would be to pick a few champs for each role and practice them, learn all the builds, optimal summoner spells, etc. I wouldnt choose kat unless you really want to put work in. I would suggest you keep playing ziggs, ahri, and pickup something like Lux, Annie, Velkoz, Kennen, Viktor
And for jungle kindred and xin are OK but not really that good. I would play them in certain situations, but also learn some of Olaf, Zac, Hecarim
Or just ignore me and play whatever, but the best way to learn is to play as few champs as possible. Also look up optimal builds and summoners on sites like op.gg or probuilds.net
add me in game if you got more questions