If you are a citizen of a country that does not recognise Joe as elected I recommend sending them letters showing your approval.
Slovenia https://web.archive.org/web/20201105013923/https://www.msn.com/en-us/news/politics/slovenian-prime-minister-claims-donald-trump-has-won-election/ar-BB1aG5OC
Mexico https://www.timesofisrael.com/liveblog_entry/mexican-president-says-too-soon-to-congratulate-biden/
Please add more in the comments.