Work out what you think it’s worth and stick it up for that - your “minimum price” is irrelevant to everyone but you. I tend to accept and listen to lower offers.
Go low if you just want the cash but don’t be surprised if it turns up on reverb a week later with a 200% mark up!
that said the great post covid price spike seems to be dying and I would question if some ‘advertised’ prices have bared much relation to sale prices.
the other thing you could do, depending what it is is look round on here and reach out to people who have owned or own similar make/model basses and get their view, for instance a while back I was looking at vintage precisions and the advice and expertise of members of this forum was invaluable.
there tends to be clusters of owners on here of most things