I switched over to a RaspberryPi attached to a 1TB drive, running Nextcloud a couple years ago and haven't turned back since then. Background sync, auto upload, facial recognition and tagging(using digi-kam)...it's got it all! Silently chugs along in the corner and updates rarely fail. An old machine with attached storage should work as well!
Todo app for bookmarks! Unmark is designed to help you actually do something with your bookmarks, rather than just hoard them. A simple layout puts the focus on your task at hand and friendly reminders keep you in line. Filtering options let you find what you're looking for.
BirdNET - android app for Bird sound identification
Seek by iNaturalist - identifying bugs - gamification