I continued using Nextcloud, and it became much more polished this year. It keeps my files and contacts, manages my photos and fetches all the interesting news and podcasts for me. It also has a decent project management functionality, and I use it to collaborate with other people on different projects.
Nextcloud has a great potential and practically no competition. It’s the easiest way do replace Dropbox and/or Google cloud services such as Google Photos, and I’m planning to write a detailed guide on how to set it up and running.