My first focus is sharing, search and discoverability.
The biggest issue is that I have thousands of photos but I don't have a good way of filtering by person, date, location, and finding exactly what I'm looking for. Basically browsing my photos like I would browse an online store like Zalando. Search for something and refine with filters.
In addition - I implemented S3-like storage. Makes it cheap and easy to host in the cloud.
Edit: oh just saw, it's a fork of immich! Cool!