Well... I've never tried this, so if the following doesn't work, please don't blame me, fellow brother.
First, use a VPN to access OnlyFans; I would ask which country, but I feel that would be too personal.
Note: While using a VPN, don't go to most European countries (mainly UK) since they force OnlyFans to verify your age which will require you to scan a QRcode with your mobile (not a good idea in your country, I presume). Stick with the US (personal experience).
Method 1:
Then, open up amazon.com (Note: It is 'amazon.com,' and not your countries amazon) or any other countries amazon, and then buy the pre-paid cards from there, such that they trace back to the US or any other country and not yours.
Lastly, use those cards to get subscriptions.
Method 2:
Since OnlyFans also takes PayPal, you can make an account there, send money to the PayPal account, and then get subscriptions.
If you are a bit scared that it can be traced back to you, you can always use the pre-paid cards as you like.
Method 3:
(If you only want to get the free subscriptions)
Use vccgenerator.org to get credit cards, add them to your account and enjoy.
(I saw this method here on the forums but forgot who gave this method, anyway, kudos to you man, for this method!)
That's all from my side, brother; I'm sorry if this doesn't work out; it's worth a try, I guess.