Reduce GETH ETH Node Disk Space Usage

So, I have a ETH2 validator node which uses a Hetzner AX41 dedicated server and has been running since genesis. The set-up includes a GETH ETH1 node, beacon chain and the ETH2 Validator (Prysm) and is slowly using the allocated 1TB NVMe disk space (2 x 512GB using RAID 0). I reached out to the Prysm Discord channel to seek advice and what is best to do. A very friendly chap replied and I thought it useful to share in case anyone else has the same challenge.