Should I quit the newsletter? Or are people interested?

I have a newsletter where i translate the latest scientific articles into plain english.

Everytime i write a new article, i post a summary of it in a couple of sub reddits to see if people like the content and try to raise a few subscribers that way.

People always seem to resonate with my content and end up getting upwards of 100k views and 100 upvotes.

I ve been going at this for 1 month and have only gotten one sub from all of that.

I ve now tried also running some ads on X with my best posts and have only raised 3 subs with 40usd. Im planning to finish the test at 100usd, since i ve messed up the ads a little bit

But at what point should i take the hint that this is not something people are interested in?

Am i giving too much attention at the signals from the engagement of the reddit posts? Maybe im reading wrong that people would be interested in such a news letter?