The gist of the article is: The OP created a tiny project, launched it on Product Hunt/Hacker News, and moved to creating another project. I'm glad he acknowledges the problem with this:
"A Product Hunt launch can easily get you a spike in traffic, but afterwards I really don't know what I'm doing".
Here are some tips to help with this:
1) Explore more "steady" acquisition channels. Yes, PH/HN are "spike-y" channels and they're often not enough to have a business generating sustainable income. Read "Traction" by Gabriel Weinberg (I'm also doing some research on this topic [1]).
2) Maybe flip the script and do the opposite? Choose 1 or 2 promising projects, and do "six months of exploring user acquisition". Test SEO, FB/Google Ads, partnerships, affiliates, appstores and so on.
Good luck!