• Consider Nextcloud instead of Syncthing. This gives you options for a Google Docs replacement, too.
• Nextcloud notes is a pretty good Keep replacement, too (if you just need simple notes)
• SearXNG is great for seach, and includes DDG
• Love Osmand for hiking/etc, but Organic Maps is a bit better for navigation unless you do some major config changes in Osmand

If self-hosting:

• Nextcloud can manage users/calendar, etc, too
• Immich is more battery efficient than Ente, since the AI is server side. But only for self hosting since no E2E
• Skip Proton for things like self-hosted Vaultwarden. Why use another centralized service?