When I'm in marketing mode and I have to spam, I do my best to keep a 1:1 schill to not related to my product comment ratio. As a founder it is your job to spam your product but I think there are ways to be tactful and give back to the platforms you're schilling on.

I also find that it's way more effective to live in the comment sections. Rarely does the "Hey, look at me, I'm selling a piece of software" post genuinely do well. It's always so tempting to do that too but It's way better to find someone asking specifically for a thing you're solving and respond to the individuals.