There are so many things you can do when trying to build a product and company.
It’s easy to really focus on some key metrics and go all in trying to get those up. This isn’t bad, but early on you never really know for sure the metrics that matter are the metrics that matter. There’s a lot of fuzzy in-between.
What to fill it with?
If in doubt, do the thing that customers find more fun. Do the thing that team members find more fun. Do the thing that you find more fun.
Having fun adds energy and exploration and determination. Not having fun, you can only get so far on sheer willpower.