I have several selfhosted services that I have been using for months, now I wish to access these while I am not at home. Likes of nextcloud, nocodb, wikijs and other media sharing self-hosted services

I would like to know what precautions should I take so no one knows that such a domain exists.

should I purchase a crazy numbered domain like 671341412312.com ? or should I go for .tk domains.

Would like to get some suggestions from this community on other aspects that I am missing.