Drop the free plan and lower your price point. I would also listen very closely to your customers (free or not) and even ping them for ideas. Add some features and get creative. What if you added some SEO enhancements? You are using FB as as your content interface, so, you're going to have to find out how much SEO you can do with content coming from FB. I'd also add in some free tools. What about emailing analytics to your users for free each week? You could auto sign them up from something like hotjar.
If you don't have customers then it's one of 3 things:
1. Your pricing is wrong.
2. Your value is too low.
3. Your marketing is not working.
Marketing in particular is probably an issue, 1-2 signups a week probably means eyeballs are simply not getting to his page. If he's already dealing with Facebook he should probably look into an aggressive Facebook ad campaign.
If you don't have customers then it's one of 3 things: 1. Your pricing is wrong. 2. Your value is too low. 3. Your marketing is not working.
I would ask around at https://www.indiehackers.com/ for advice as well.
If all else fails, sell it at flippa.com and try something else.
FWIW your presentation is attractive and the explainer video is a nice touch. I wouldn't give up just yet. Maybe you just haven't found your niche.