Honestly, the average launch doesn't get a rush of visitors whenever you 'make the big announcement' -- that kind of thinking isn't really grounded in reality. You may hear about it on HN, PH and the Twitters, but they're the exception, not the norm.

Reality is that nobody will visit your site after you launch and you'll have to work really, really hard at getting those first few customers.

I've put my hopes into the 'launch rush' before and was crushed when it didn't happen. (Twice, actually.)

You built the MVP, and that's an awesome milestone, but that doesn't mean the hard work is over -- it's only a start of a different kind of work.

Just pull the trigger and deal with issues as they come in.