After analyzing a few comments in here and looking up the product:
1. Don't think scheduling on social is a needed enough problem to solve
2. It's overcrowded with products (I'm personally using Typefully)
3. Requires lots of integrations, sleek UX and more - too much for an indie hacker and that's only from the dev and UX side without growth marketing.
At this point you've basically proven that there is either no need indeed or the product isn't good enough if people end up trying it.
In terms of pure value, scheduling doesn't get people much, unless they have to do it for work, manage multiple accounts etc - can target these people specifically and with features that are specific to them and see what happens: I doubt these people spend time on product hunt and whoever needs to do that scheduling for work - mostly boring companies.
What I'd do now:
Especially since you've got your blog going, your landing is looking good I'd try:
1. Get a product designer to look into it
2. Pay user or a few for detailed feedback, their expectations, reasons for quitting and journey overall
3. Switch to build a higher value product, bet you've got many ideas while building this one - look for the pain, problem to see how much value there is in solving it
- quick projects like that will push the socialkiwi as well and your personal account will grow with it
4. Post your product for sale on tinyacquicitions and similar to get some of the money out of that work without spending any more of yours into it
5. Can reach out to other builders who work on schedulers
Good luck!