I haven’t had that experience, but have similar instruments and would never describe my kit as a collection. They are just my basses.
If the responsibility for stewardship of the financial value and liability for loss or deterioration are an ongoing concern which outweighs the pleasure received from the utility or ownership, then you are sensible to sell. The possessions own you.
I could part with a few, although they all get used, but there are a couple that are the best of their type I have played, so effectively irreplaceable. What is the point of selling the best bass or guitar you have played while still breathing?
In the past I have sold very good vintage kit without regret, but only to buy better with the proceeds.
You must have kept at least one?