I am very rusty at this game.

8 months ago, I decided to quit league to re-evaluate my life. Now, I have decided to come back to play the game casually and HOLY SHIT I'M BAD. I am an Ahri and Lulu main and while I haven't had much issues when playing support, how much my skill has degraded really shows in other roles that I decide to play. At my peak, I was easily able to go 3/0 with Ahri without much issue but in my previous game I went 4/11. It makes one ask, what the fuck happened. I am not particualy upset about being bad because otherwise I wouldn't even bother but I think it would best for the sake of my teammates for myself back to my former glory. Please keep in mind that I won't be able to play more than 7 games a week because of how busy my life has become. Tips would be appreciated.