I am looking for assets but some users (that I am not going to name of course) post every single sprite/product they have made as seperate products and it really floods certain tags. I have nothing against the users of course but this situation unfortunately makes it more difficult to find what I am looking for.

Is there any way to filter out certain user's assets/products while searching/looking at game assets? I am open to third party solutions as well if anyone has any solutions...

If you search and not browse and find assets of those users, maybe they are what you are looking for. If it is single user, use find in page function of browser to highlight and ignore user.

Or go fullignore with  a user    style with Stylus extension. Tested with Crhome. But you might not see anything from that user in your library, so maybe use better  url filter than domain.

@-moz-document domain("itch.io") {
div.game_cell:has(a[href*="//username1.itch"] ) { display: none }
div.game_cell:has(a[href*="//username2.itch"] ) { display: none }
}