I have been experimenting with a couple of domain names the last months. Like https://rant.foo and https://ftw.lol .
They’re still usable for next months. But I settled on a main Domain (for now). This means, every current and upcoming service will be a subdomain of this new main Domain name.

https://rootdo.com (rootdo.net and rootdo.org also work, but the main domain is rootdo.com)

rant.foo and ftw.lol still work tho. But some services need adjustment like https://flux.rootdo.com ( https://flux.rant.foo https://flux.ftw.lol )

If you use the API, you may need to change the URL of it into http://flux.rootdo.com/v1/