Geeetech i3 pro B upgrades

[Limon1]

I just bought a second hand geeetech i3 pro b from eBay for £20

I currently have an Ender 3 so am printing a spool holder and PSU cover currently but wondered if anyone with this printer already could recommend any upgrades that are important (I already have yellow bed springs spare from a set for my https://speedtest.vet/ https://vidmate.bid/ Ender 3 so will probably replace them).