Champion ideas for next champions

Good Morning Everyone,

I'm just getting back into the game the last few weeks and was hoping people could give me some ideas for some champions to use or get for ranked games. I currently use Lux to main mid, Top is Darius and Teemo, Support is Janna and ADC I have Jinx, Luc, MF, Cait and Trist to use just seems like I do something wrong adcing. I can be great or just average I seem better soloing the start until team fights. Weak point is JG, I'm just looking to improve with maybe more options in each lane for counters etc. I have a good chunk to pick from and can buy some but trying to fit my play style. Which is a somewhat aggressive play style and then the team will run in middle of fights and i end up dying if they do 25% of teams stay and we then win. Any help would be grateful.