I've been reading a bunch of similar posts over the last few days and it seems many people have had similar experiences. Although this might not sound constructive, I think it's important to remember that a feeling of audience-less-ness is common no matter what your industry or artform is and many people are walking the same wilderness as you are.
I think for myself personally, I'm inoculated against the disappointment because I've worked previously in publishing and radio and came to realise that the work we were outputting was going out to an audience of functionally zero. Whether that's true or not is impossible to verify, but if you receive zero feedback for your thoughts and labour the result is the same either way.
But in any case - You're doing the right thing by starting this conversation and voicing your experience. Small things like this build connections (I don't mean that in the cynical marketing sense of the word.) and will bring eyes to your work. You don't have to 'spam', but any sincere expression or communication that you're comfortable with goes a long way at creating a presence online, and whether we like it or not 'online presence' is the rule of the game these days.
(You've gained a follower in me, anyway.)