Helping others privacy through self-hosting?

Hello all, I'm relatively new to the realm of self-hosting. Over the past few months, particularly in response to recent events, I've been actively advocating for privacy, security, and decentralization. Initially, I began by implementing Nextcloud for my family and friends, and later expanded to include services like Immich, Jellyfin, and more. Recently, I've also set up a Tor relay (non-exit to avoid unnecessary attention). I'm looking for suggestions on other projects, tools, or areas to explore that can contribute to enhancing others' privacy. I appreciate services like a Tor relay because once set up, they can run relatively autonomously. Are there any similar services that others can benefit from without requiring consistent direct input from me? I've got a few spare Gigabit lines and ~20TB of free space I can spare for the greater good.