Venmo is only available in the US.

Cash App is only available in the US and the UK.

Consider adding PayPal info (careful not to dox yourself!), stating what gift cards you would accept (most of the time it's possible for someone outside the US to buy a digital gift card through a US website and provide the code to you) or if you are a more frequent flyer perhaps consider LiberaPay or a similar donation/crowdsource platform (N.B. I don't use LiberaPay, I haven't heard anything good or bad about it, though it appears to be fee free but you should still do your due diligence and check the conditions like minimum payout amounts and how frequently you can cash out etc. Don't take my mention as an endorsement or anything beyond a suggestion).

If you take these steps then you're going to make more opportunities for people outside the US to donate to you.

(A follow up suggestion to the mods: requesting gift cards may open the door to struggle sessions regarding boycotts and poverty-shaming.

Might be worth adding a rule prohibiting people from grilling people over these matters; if someone cannot buy an Amazon gift card for someone else due to matters of conscience that's perfectly reasonable but it's not cool to chastise a person who is experiencing financial hardship and/or major access barriers over opting for Amazon gift cards for those reasons. Boycotts are often a luxury to people who are experiencing desperate circumstances.)