Right after putting finishing touches on MVP of the website, I have posted it on subreddit r/learnmath.
After 1 day it was nr 1 post on the subreddit, and after 3 days it gathered over 350 likes.
I got more than 2000 page views and more than 600 user visists.
But what is more important than numbers, are peoples reactions:
"I love you"
"You there sir, you're a hero! Thank you."
"Whoa, this repo is what many of us (particularly those in Engineering research) need!"
"I really needed something like this."
(Note how these 2 last posts say NEEDED)
Not only that, I have seen my link was shared on facebook by somebody, without me asking for that.
On the website there is a link to simple google form allowing people to submit math resources they know about. I already have 30 submissions which I have to go through.
All these things show me that there is a pretty good potential for my project to be successful, which makes me very happy and motivates me to continue working on it.
Next step will be putting some fixes based on user feedback, adding new content and adding some social media stuff to start building a community.
After that I will launch on other platforms, like hacker news, other math/science-centered subreddits and some facebook groups.