How champion mastery actually levels up
Mastery levels 1 through 5 unlock purely from points earned per game.
Levels 6 and 7 work differently.
Mastery 6 needs one Mastery-5 token (earned from an S- grade or better) plus points; Mastery 7 needs two Mastery-6 tokens, meaning two more S grades. That S-grade wall is the hard part, because the grade depends on KDA, CS, vision and objective share relative to everyone else who played that champion that patch. The 2024 mastery overhaul added Mastery 10 and milestone levels on the same point logic at higher thresholds — you can ask about those in your request too.