I am not sure if I have to means to pay for a mentor at this point.
Are you sure you need mentor though?
I mean there's a lot of developers who didn't even attend to any University and they become very successful.
You have whole internet to learn from
And they probably had good mentors or someone who guided them through the process...I think.
not everyone,
I am self-learned, I worked in different countries, never had problems with finding and keeping a job
Don't pay a mentor. A person who takes money for mentorship is a grifter not a mentor. A mentor provides advice and opens doors because they believe it is the right thing to do, a relationship built around money is built around money.