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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.
Nextcloud shouldn't be too hard for you to setup given your background. If you've ever used or heard of Docker before then you can start a basic Nextcloud container with the example they provide on Dockerhub.
I've migrated to Rocky Linux on my home server as a CentOS alternative after they announced the shift to rolling release at the end of this year. I've used TrueNAS Core and Scale before but I actually prefer managing ZFS and everything else via CLI.
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.