For those who've launched before, what would you do differently if you were to do it again?

Congrats! In the past I had built up blog posts in advance, but after the first few weeks I stopped posting regularly, and then my traffic slowed. Next time I plan to build up blog posts in advance again, but also devote more time to regularly come up with future blog post ideas, AND spend time writing them. Overall, I just need to be better about staying ahead of the content I need to post and try to keep posting regularly.