If you really want to move to a more stable solution with RAID go for hardware level RAID not software.
Software RAID is total crap bullshit and you could lose all your work.
Buy a decent desktop or barebone PC with a motherboard that supports at BIOS level (hardware chip RAID) to create a RAID volume.
Then plug 2 disks inside or 3 disks for RAID5.
Install on that machine Debian OS + Umbrel, then follow point 6 or 7 about how to move your node data to the new machine, from this guide