I’m active on multiple channels. If you find a bug or want to request a feature (or ideally prepare a pull request) please do so on the respective repository:
Issues: GitHub
Other than that there are the following channels:
Slack:
Forums
English: https://community.contao.org/en/forumdisplay.php?143
German: https://community.contao.org/de/forumdisplay.php?28-visitors
Donate the developer: Amazon wish list