Was in the same situation. I replaced it with https://sabre.io/baikal . It works fine for me with DAVx5 on android.
I had radicale running for some years, it was finicky to set up I remember doing a fix in the code. But when it worked it did so without issues. Not sure how active development was in the last years maybe it has improved.
I'm trying radicale now, it seems to work with the clients I'm using, even HomeAssistant. What I like about it is it's simplicity, it just stores stuff in the file system. But yes setting it up is a bit finicky. I installed the debian package and that makes it a bit better.
Running baikal on a Raspberty Pi with a DietPi OS for a cople of years now, runs smootly.
So I tried Baikal, there is one problem with it. HomeAssistant promisses that it works with Baikal but there is a bug preventing it from working since 2021 and it's not fixed yet. So this prevents me from using it.
Radicale. Setup was a breeze and Just Works Fine. A piece of set and forget software for me.
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