Champion pool expansion help

I'm sick of being silver 3, 0 LP trash, and It's time to git gud. I'm going to play 100 draft games for each role and do my absolute tryharding best to do good every game before I go into ranked. However, I'm thinking to get 3 champs to play for each role. My current main role is jungle, then top, then mid, then supp, then adc. Champs I play are as follows.

Jungle

Rengar, 225k mastery

Shaco, 76k mastery

Evelynn, 74k mastery

Zac, 14k mastery

Diana, 36k mastery

Shyvana, 81k mastery

Toplane

Olaf, 160k mastery

Darius, 80k mastery

Kennen, 30k mastery

Shen, 50k mastery

Teemo, 23k mastery

Rammus, 47k mastery

Midlane

Fiddlesticks, 310k mastery (OwO)

Azir, 20k mastery

Syndra, 18k mastery

Zoe, 4k mastery

Adc

Caitlyn, 130k mastery

Jhin, 30k mastery

Draven, 7k mastery

Support

Thresh, 43k mastery

(And I've played a lot of pyke, and I like him, so he's pretty much on here)

I almost never play support, I havent played adc for months, and I only played rammus pre-work. Also I used to main fiddle, but the nerfs forced him out of every lane, so RIP my former main. (I played rengar after this for a while, and still do.) I have an EXTREMELY agressive playstyle, and I can play an early game lead at gold-plat level, but when I get behind I pretty much drop to bronze V, Which is why i like champs like darius and rengar. I also like huge plays, like fiddle and kennen ult. Also, I can't freeze wave effectively in lanes. I'm trying to learn azir atm. If you have any tips at all, I would love to hear them. Also, feel free to add me!