if I were you I'd seek to sell it instead of open-source it. "pivoting to adding value with LLMs on top" is very expensive from a COGS standpoint; and will complicate your business economics, not simplify them.

You don't seem to have a problem where open-source is the answer; the problem you seem to have is you built a business and a business model you weren't intending to build; and you don't solve that by open-sourcing. You can solve that a myriad of ways, but none of them are readily solved by open-sourcing your product.