Please consider contacting the 'Blue Maxima Flashpoint' Flash Preservation Project here:
Consider providing an open/permissive license for them to preserve and archive your flash games for posterity <3
Doing so will also reach a much wider audience than itch.io!
They have a Discord server linked on that page that you can join. Tell them you're a game dev interested in contributing your games and they will help with the rest. ;)
I fully admit my own ignorance of this project prior to someone PMing me about it on my Discord server. It is absolutely wonderful that a 'sandboxed' archive of flash games/demos and gaming history can be preserved for posterity. ^_^
The way they preserve games runs them in a contained sandbox and mitigates issues with system-based Flash installs or any Flash malware.