TL;DR: I'd separate race from ethnicity.

I completely understand that! I think the survey is overall pretty good, and just wanted to add some perspective for future surveys if this place ever gets very big and international. On how I would have structured it, I don't have anything close to a perfect solution, but I'd probably separate the concepts of ethnicity and race into 2 distinct questions.

In the US-ian traditional view, ethnicity and race are heavily interlinked, but that is not the case in many non-"white" countries. In my admittedly very limited view, ethnicity is usually linked to a personal cultural identity, so I would personally have marked something like Latino (not Hispanic), Brazilian or if on a less international level, Nordestino. However race is (imo) usually defined by those at the top and varies widely per country, so in Brazil I'm white, but in the USA I'm latino, and depending on the time period I could have been categorized as "half-black" due to having black grandparents. While ethnicity is much easier to choose, race is actually very relative and subject to the racism of any particular culture. I personally marked white, as that is my current experience of race, but that is not at all my ethnicity and I do align way more with "Latinos" than with Anglo/European white people in culture and identification.

So, if I were to propose a minor change for a future one, I'd just allow for selecting multiple races at the same time, but making it so that you can always put some small explanation like ("white in Brazil") without having to mark "Other". But on a larger scale with more people answering, I'd make it two separate questions. One for broad ethnicity (say Mezoamerican, Sulamerican, Caribbean) which is already somewhat indirectly accounted for by the "Which continent are you from", and changing the "country you're from" for a more specific free-form ethnicity/nationality question. I understand that this last one could create a large overhead on processing all the badly formatted or rarer ethnicities, so take it with a grain of salt.

And then I'd add another for "race" for specifically how that person is racialized in their society, such as "Native American, Black, East Asian, White, Latino, etc", being allowed to select multiple at once. This of course isn't perfect, but I think is a good direction to reduce ambiguity of whether it is the person's designated race in their own land or the one they'd be assigned in the USA/Europe lands.

Thanks for the reply too! And I'd love to help with anything else that I can in here if y'all need it! I have some programming and data science experience and am really hopeful for this forum.

P.S.: really minor and unnecessary point, but I also missed a "non-amorous" option in the relationship status which a very "me" thing and is not important at all, but since I'm here...