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To some extent I think you can do most of that on Lemmy.
You can upload images for your posts (not sure for short videos) and cross-post them to other communities.
Edit: I don't know kbin.social but I suspect it would be more adequate to what you want to do.
You can @ Lemmy communities and it will create posts there (not sure how well images federate)
Which instance you signed up only affects your "Local" feed (no idea if PixelFed has one, haven't checked). If you're posting primarily about your miniatures it may make sense to move to a specialized instance rather than a generic one like .social.
PixelFed and Masto federate really well so all you have to do is follow and get followed by people on the tabletop focused instances (which you already may be without realizing) for your things to end up in those communities.
There is also https://a.gup.pe though I have no clue how it intersects with Lemmy.