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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
Take a look at Pixelfed. I haven't tried it, but it's what usually comes up as an Instagram alternative.
Unfortunately you sit in the same boat as all the selfhosters. We all wait for something to come out, to replace Google photos. Best and promising thing so far is Immich imo. It's still early in development and more for testing things out. A stable release is somewhat around the corner, but will probably take a while. If you can help, then go ahead and talk to the dev(s). Maybe you can bring in your software engineering and help the community to be truly free from Google. Thank you in advance!
If you want to keep your data private in the cloud, something like Cryptomator can source encrypt your data before uploading them, and they have great mobile clients as well to allow access on to go.