What you have built can definitely become a product supporting you with a very nice income. Free version can stay free but you can sell solo licenses and team licenses as subscriptions. Paid license users will also have your support - and that matters to companies.
As others have said, commercial features can be built on top of the OSS product, like Electron desktop client, support for more databases, for views/procedures etc.
There is no downside to trying to commercialize this. Whoever wants to use what you have built so far can continue and I guarantee that many companies would be happy to give you $50/month for a more advanced version with support.
(edit for typo)