https://makeaskillcheck.com/5e-tiers-of-play/

1st—Levels 1 to 4: Local Heroes
2nd—5 to 10: Heroes of the Realm
3rd—11 to 17: Masters of the Realm
4th—17 to 20: Masters of the World

https://www.reddit.com/r/dndnext/comments/i33kv5/what_level_do_most_campaigns_stop_at/