Depending on the DE you use on Nobara, use GNOME Disks or KDE Partitionmanager and just open that thing and look at it.
It may have several partitions you dont need anymore, and /home is separated, containing all your users.
In that case you could just delete the others and resize the home partition to fit the contents.
If you have a / partition, you can still remove the /boot and /boot/efi and maybe swap partition. Then resize the root partition to fill all the space.
You need to mount the disk in your filemanager and use admin:/ to open it with privileged access.
Open a terminal and navigate to /run/media/USERNAME/DRIVENAME
In there do sudo chown -R USERNAME *
Then after you broke everything an OS would need but that you want, move the stuff from the homes to your root folter from the GUI filemanager. Move, not copy.
Afterwards you may want to do some ext4 repair magic, as I dont know how well ext4 likes messing around with partitions.