You can easily selfhost Seafile and make a ‘dropbox’ like system with as many users you like, and as large a storage you can handle / afford. Although there is an enterprise version, the community edition provides with many features to make it really a great service. It is mighty fast, and has native clients for many different platforms, in addition to using the Seafile website to acces, upload and download files.
I never hosted Nextcloud, but from what I read, it is a beast with way too many features to fit my use case. Seafile is doing one thing very well.
That is one thing I still need to do, upgrade my Ubuntu server from 22.04 to 24.04. laat time I tried this I noticed many python packages were missing or failing. Reverted to the backup. Maybe now is the time to do the switch and iron out the crinks that may be left after.