We were in W21 batch, so Jan 21. It was just after we released the first version of Wasp somebody could actually download and try out (before that it was just the landing page with the vision statement + gh repo with Haskell source). We got some good feedback on Product Hunt and Reddit and I believe that also helped.

We documented our adoption journey (through gh stars) here (https://wasp-lang.dev/blog/2022/09/29/journey-to-1000-gh-sta...), and we also marked the moment when we were accepted in YC (we actually applied 3 times in a row!).