There’s a problem on strava with activities getting buried. When someone visits my profile, I would like them to be able to see the activities I’m most proud of. I think the perfect way to implement this is something similar to Instagram story highlights. With an implementation similar to story highlights, you get two features in one:

Use case 1 is simply to have individual activities pinned. That’s possible with story highlights: you can have a highlight that is only 1 story. This use case is something that has been suggested before. 

Use case 2 is that you can now pin a full series/group of activities. You could, for example, create a highlight that consists of every race from 2024. You could create a highlight that contains every day of your multi-day cycling trip. The possibilities are endless.

This second use case is unique. It would also allow you to group activities so they show as somehow connected. Borrowing the scenario from the second example, each activity from your multi-day trip can now say ‘Part of 2024 Cross-Country Trip’ or whatever. 

This would be really cool to see implemented, and would tackle 3 missing feature areas within strava at once.