[JTysver]

There are plenty of traders.
I trade every week.

Your want list and condition requirements are very selective.
Since you seek higher end cards, rare cards and super stars, most people I know who have that stuff either have it in their main set (not dupes) or would prefer to sell it since it gets a premium return.
I have a few of the cards you need, but can't meet your shape requirements and I'm not planning on trading my main set cards for them since I'm trying to build a Topps run.
If you were to build with mid-grade set fillers and upgrade as you need to (I know a lot of traders who do that), that would probably open you up to a lot more traders.

Oh btw, Let's Go Mets!