@r0se super sceptical about copyparty- it looked really sick when it dropped but it was pretty clear that it wasn't ready for primetime at that point. idk where the project is at the moment but i certainly haven't heard of it used in the field since the hype cycle died out.
i've been very strongly considering just building my own from scratch because of how much nextcloud has infuriated me (all art is born from either lust or spite)