I'm curious how it compares to Standard Notes. Have you tried both by chance?
F-Droid
F-Droid is an installable catalogue of FOSS (Free and Open Source Software) applications for the Android platform. The client makes it easy to browse, install, and keep track of updates on your device.
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Been using orgzly for a while, I had no idea it was abandoned?
There is an update on f-droid from 15th November, where do you see this is abandoned?
If you follow the FDroid link to the GitHub, you can see it's a community revived product. The original's last version was from a year ago.
Doesn't look like the revived version has had many updates, but hopefully it keeps going. I'm a Nexcloud Notes user, and I wouldn't be surprised if it's popularity is part of the reason for that.
Thanks for letting me know, I was not aware this can happen to an app.