Prog isn’t all keyboard solos and wizard capes (though that stuff rocks too!) - a lot of what’s referred to as “prog” is only labelled as such because, upon release, no other term would do.
If you find yourself getting heavily into King Crimson - which can happen quite easily, as they’re fantastic, the logical next steps are The Soft Machine (jazz/avant-garde fusion) and Van Der Graaf Generator (proto doom jazz).
And if you find yourself getting heavily into them (which, again, can happen quite easily), then you might try giving Yes a go. On some of their early albums they radiate pure power - despite, or perhaps because of, the wizard cape.