While it would be nice to have additional payment options for a lot of reasons, any additional payment options on Itch would probably not help you. Any new system they would adopt would very likely adhere to the same restrictions in receiving countries, as the other systems. And things like crypto are failing for different reasons, even if adopted, it just is not viable for low amount transactions.

But Itch is such a nice and selfless place that they allow people to post links to other sites. Including patreon and steam. I never saw a link to another store on steam...

So if you find an artist support site that allows money transfers to Cuban artists, you can just post links to it on your pages. If the company is not located in the US, that might be possible.

Although, you should not put too much hopes into receiving money by this. There are many, many people trying to turn their game making hobby into a job, and even with payment over Itch it is very hard. Oh, and being underage is another hurdle, not only for having and managing bank accounts. You might not even be allowed to make money in the first place on Itch. Read the terms of service. Publishers affirm that they are either more than 18 years of age, or possess legal parental or guardian consent