Where can you sell a non-profitable SaaS?
Are there any platforms where you can sell your non-profitable projects?
Looking at it from the buyer's point of view: what is the value in a non-profitable project? Even if the idea appears to be good, it would require considerable investment in effort (at least) before it will generate any revenue.
Even for acquisitions of profitable businesses, there typically is a an "earn-out" component. That is, you only get paid if certain revenue/profit milestones are attained.
An unprofitable project is debt. No one is going to pay for it. Just cut your losses, shut it down, and move on.
I don't know of any platform for this. You could ask around on Indiehackers, or just think about who could be interested in that project and google around to find potential acquirers. Who could add it to their existing offering as an interesting bonus, or add it to their core product?
NASDAQ. Or make an NFT of it.