Any online payment method is not anonymously, because your PP or Bankaccount or whatever online payment you use,
is locked to your name.
If you want real anonymously, you have to use an offline payment method like cash.
Some BTC-ATMs dont require KyC.
Maybe you are already happy with an anonymous platform where you dont need to make kyc verification.
All big exchanges where you can trade with fiat, require now KyC.
So you should use Peer2Peer platforms that dont require KyC like
https://hodlhodl.com/https://localcryptos.com/Well you can also trade here on Bitcointalk forum, but here the percentage of scammers is very high, so only do with escrow and be careful.
Anyway, as Creditcard payments are extremely easy reversible, to do this anonymously will be difficult...its already rare to buy crypto with vcc AND KyC.
Well, you always can purchase Giftcards and sell them for BTC, but the fees will be high...