Nextcloud aio - Systemstorage loop2 enlarge

Hello, I have installed nextcloud aio on an Unraid. Now I have realised that my system memory is only 20GB. For whatever reason. I have no idea what I have done wrong. My data storage has 4TB. I’ve already done some research and apparently you can increase it. I just didn’t understand how…

I found the command sudo df -h. I’ll post the result here. I came up with it because I wanted to install the server for Onlyoffice, and apparently this is not possible due to lack of memory…

Maybe someone can explain to me what I have to do. Thank you!

So, I’ve made some progress. With the command

dd if=/dev/zero bs=1MiB of=/path/to/file conv=notrunc oflag=append count=xxx

I have extended loop2. lsblk also shows it (see photo). df -h unfortunately not yet. i have it with

resize2fs /dev/loop2

but this does not work. How can I make it available for Nextcloud?