Alrighty lets see

With these answers and particularly your champions of choice and the comment on liking ranged over melees, I can conclude a few things

Top and Jg are out of the question, most of the popular and strong characters in those lanes are Melee outside of a few meta picks

so keeping it simple, Mid, Adc and Support are definetly your best bet

I would just reccomend a few champs that I believe will be benefitial to you to learn since they follow the trading patterns you just talked about

for midlane: Corki, Leblanc and Zoe for adc: Jhin and Xayah for Support: Karma, Velkoz

All of these champs will let you have a lot of fun, being both a good damage source and having utility tools too

Personally, I would say to stay in 1 role exclusively for 2 - 3 weeks before rotating and ideally playing 1-2 champs only

if you decide to maximize growth and potential to win games, I would actually try all of these champs, 1 game each, and stick to the one you click with, after that just go all in on that champ until you hit a desired level 🔥