The resources section on this website allows people to contribute filters, presets, masks, etc.
How about setting up a convention, where users get to vote their favorites each month, and the winning entries are included in the next release of Shotcut as user-contributed assets?
It’s a win-win-win proposition:
- The contributors feel appreciated, and get motivated to contribute more
- The users get new assets each month
(good quality is assured because of the voting system) - The traffic to this website would get a boost because of frequent visitors
(That would improve its SEO ratings, which would promote Shotcut even more!)