I run a streak-based community too (but for daily writing), so just to share my experience:

I'm aware of the pitfalls of the conventional, consecutive day streak, so for Lifelog I created different types of streaks each with their own leaderboards (golifelog.com/community) so that everyone can grow in one metric of their liking.

• Top streak (consecutive day streaks)
• Best streak (longest streak ever)
• Most streaks (the number of times someone broke their streak but bounced back)
• Most posts (most prolific writers with most number of posts)
• Most comments (Those who chat a lot to make everyone feel at home)
• Most goals (on Lifelog they set goals to write to)

Maybe for WIP, could consider Most streaks model alongside top streak model? That way even if one breaks the streak, there's a number that still grows.