Srsly? I do 50 gigs a year with a rock'n'roll band and my pre-owned (small-bodied) Kolstein Busetto after three years looks nothing like as bad as yours. 🧐
I know very little about this make, and all I could find online related to someone called Dub on Basschat (in East Fife) selling his 10 years ago. To you, I imagine? What do you imagine this bass would be worth if in pristine condition?
It looks to me like the only way to stabilise the condition of that bass would be a complete refin with a much stronger lacquer / varnish being used, especially on the edges. Best bet would be that the refin might cost more than the value of the bass, certainly more than the value it would add back to the bass.
Looking at the damage, it looks like a worse example of the damage I have done to 3/4 and 4/4 basses when laying them down quickly on the stage as I switch to electric bass mid-set. That doesn't happen with the Kolstein because it's too shallow to lay on its side. Do you have any idea just how that damage was actually done?