Thanks for documenting what you've been doing.
My main thought midway through your narrative was wondering when you'd realize you're building out a datadog-like tech stack - you mention I think splunk at one point in there at least.
I think a thorough review of datadog and a competitor or two might be interesting for you; the market for 'use SQL for everything' is pretty small. The market for 'use dashboarding tech to read ALL the data' is really very large, and the command line tool you built probably works as middleware.
If I were sitting where you're sitting, I would probably look at two things: could I build a niche datadog competitor with what I've got? If so, you've got really good market comps in public companies and could probably build a pretty great SAAS-model lifestyle business at the very least, which would have value to own, sell, or get investment in for growth.
Second, if I didn't think I could, I would look into selling the CLI-SQL tool in the marketplaces of datadog and so on; their strategy is to allow partners to monetize the customer base by selling tools - this probably wouldn't be a retirement-grade result for you, but I bet the monthly income could significantly beat what you've got so far; those BI tools are expensive, and so incremental charges don't always register, especially if you're bringing new data in the system in a way that was difficult to before. In this case, I'd probably work on a couple quick hits where your tool brought a lot more expressivity to the dashboarding tools. For instance, you can pay extra for log ingestion at datadog, but the tools for dealing with these logs are somewhat limited in the UI. A similarly-priced extension from you that gets better querying might be worth a lot.
At any rate, keep it up, and good luck in the next year!