they seem to have your license there <a href="https://github.com/VivumLab/VivumLab/blob/dev/LICENSING/HomeLabOS%20License">https://github.com/VivumLab/VivumLab/blob/dev/LICENSING/Home...</a> ?<p>Their license is also seems like GPL, which is compatible with MIT afaik.
Wait a reasonable delay, like one month.<p>If they don’t comply, it’s time for a DMCA request to GitHub.<p><a href="https://docs.github.com/en/site-policy/content-removal-policies/guide-to-submitting-a-dmca-takedown-notice" rel="nofollow">https://docs.github.com/en/site-policy/content-removal-polic...</a>
If they aren't following the license you released your work under, then they're infringing your copyright, and you could send a DMCA to GitHub to get their repository taken down.