Where do other indie developers find success promoting their productivity apps?

I’m curious where other indie productivity app developers have found success promoting their apps. Like a lot of people here, I’m constantly trying new productivity tools while also building one of my own. I’ve experimented with many of the traditional channels (twitter/X, ProductHunt) but so far I’ve been interested to find ways to get in front of the right users in a cost-effective and sustainable way. Would love to hear what’s actually worked for others, especially smaller or newer apps without huge marketing budgets.