Like JWR I feel there's absolutely zero chance we could have built this product as effectively in my previous primary JVM languages. Clojure is just a better toolset, no comparison.
We recently enquired with Github about sponsoring as an organisation (rather than me using my personal account) and have been added to the waitlist for the alpha of organisation-sponsoring. Once that starts we'll contribute financially to the developers in our space who enable our business.
Also as a habit I send personal emails to open source contributors simply to thank them in person.
Good luck with your launch!
P.s. I'm very excited for the team at Cognitect. It's hard to start a consultancy, hard to launch a product, there are no guarantees of success, and they deserve all of it.
I'd suggest looking at Clojurists Together, Github Sponsors and direct sponsorships through PayPal subscriptions.
I look at it as an R&D expenditure (and it goes into my financials as such).