Submit feedback to whom? There are many things that I would like to improve; But who do you send information to?
if you know the feedback is about a specific nostr client then tag in the client developer in a public note if you have feedback on a more general protocol issue try engaging on the github or tag relevant protocol devs here (review the NIPs and you should be able to figure out who it might be good to connect with) if you really can’t tell where something should go complain to me here and i’ll try to route it to a helpful person