Ive levelled 4 accounts.
Main - all play to win ranked
2 - to play on when i go on tilt on main so I dont tank hard in ranked. Also to play w lower ELO friends and other roles
3 - to learn jungle. Frustrated with afk farm junglers
4 - to one trick zed
3 and 4 were to learn from scratch knowing nothing, starting at the base bottom level of noobs then work my way up to ranked rather than to get destroyed and tank 100s of people's games from being a total scrub at those roles and champs. All of these new skills gathered funneled to help my main's progress
Norms doesnt even really cut it for learning new champs and roles since the MMR for my norms has gotten to higher than I'd like when trying new stuff it'll drag others down and I wouldnt learn as much from just playing grey screened