BitMEX has banned all US residents so I am looking for alternatives that allow high leverages and require no KYC. Thoughts?
I think OKEx is suitable for you. You just need to pass KYC1 which is very simple (only provide your name and ID number), then you can try Perpeptual Swap with 100x leverage. They currently is top 2 exchange, and high volume trading. They have a complete Futures trading system, you should try it 
OKEx banned US residents too. Level 1 verification requires your nationality and passport number, which means providing fake information......no thanks. I've also heard some reports of OKEx/Okcoin users being forced to complete Level 2 verification. Plus the liquidity isn't even that good; OKEx is notorious for fake volume.
My preference is for a derivatives platform that has no established KYC process whatsoever. So Bitmex or Deribit > OKEx.
But I have another option for you, a derivatives exchange: https://www.emx.com/en/
They have a diverse and complex trading ecosystem with a variety of assets, and are designed for pro traders. The project has received many positive projects, and I am also looking into it.