I'm curious as to for how long you've been using this setup specifically in regard to Nextcloud, and how many and what volume of files you store in it? I've set up a few Nextcloud instances in the last 2 years on Digital Ocean VPSs and Raspberry Pis and I ran into so many problems and difficulties which scaled with the quantity and size of files I hosted on it. I took care in setting up everything to a relatively sol…
When I was picking a self-hosted Dropbox alternative, I ended up going with Seafile rather than Nextcloud since it was a lot more focused (just file sync) and people said it was much faster. It's got a few rough edges but the core functionality has been rock solid. Granted, I've only had about 100 GB max stored in it.
For the past couple of years, I've had it running in Docker on a cheap Azure VM, backed by blob storage. I've got around 2TB in there, and it all works marvellously.