Have you tried any of those sites yourself?
Coinmama is a minimum of $60 in BTC
Bitpanda I don't think accepts residents of the US
Cex.io after years of using them said that I came up as a high risk client (now can't use my account to purchase) even though I have never done a charge back anywhere and only use prepaid cards that I load to make sure that no one can steal like all my no money LOL
What is your go to P2P trading platform that you use?
I have tried Paxful (but for something else), Virwox.com for PayPal transactions (but the fees were quite high) so If you're having the same problem with the exchanges I mentioned, I'd suggest going with the currency exchange section on the forums, just make a thread, set your rates and wait for someone to P.M you, and someone will as long as your rates are fair.