Is finding a mentor overrated?

I started my entrepreneurial journey about 3-4 years ago of which the last year and a half I was fully committed to it (after graduating) and took a part-time job to cover my burn rate and gave me runway to develop my startup.

I had some wild ups and downs (of which I will focus on the last year and a half), including securing a major partnership and then hitting rock bottom after my co-founder completely burned out due to insane pressure from the major partnership, which left me in the dust with a broken project. 

I recalibrated and started putting the pieces back together, and gave it another try. This time, during the lead-up, I decided to sharpen my skills more before attempting another venture. Even though I met the my previous co-founder in person, and we were super ambitious and excited for what's to come, I did not expect him to crumble like that. I felt like it was my fault, but he said different. Still, it makes you more self aware and cautious who you partner up with. I took this to heart and decided to do a test project with my newly acquired co-founder and focused more on establishing a better relationship, rather than jumping head first in the full collaboration. We built some test projects, tested the waters to see how the collaboration went, and it felt amazing.

It was then that we decided to collaborate fully.

We spinned up the project that me as the non-technical founder established because of personal problem and because I had acquired even more knowledge about the market as it was the same target market as before. I had the relevant connections that I could leverage to grow it, as well as a strong confirmation from a strong potential client that explained what needed to change on the product for him to buy it.

With the new grasped insight, I took off and informed my co-founder with a well structured document that we read through together about the strategy and plans needed to better target the painpoint from the target market.

Suddenly, My co-founder didn't think it was the right call, despite not having any "evidence" or logical explanation as to why  it was not the right call. He said the pivot was not necessary as "he doesn't see himself using it".  Mind you, at this point he is the technical founder. I get that there might have been a dislike of building it because of not being passionate about the pain point, but that was established before, with the pivot that might have indeed changed things.

There was no way to change his mind as he seemed locked to not change. He wanted me to market the product that was currently not solving pain point correctly. Given that I already lost a partnership, this sounded like death to me, so I didn't really want to waste another connection.

So, there it was, my second co-founder break up.

This one didn't hurt me the same way, since I didn't waste any connections through it, but It really got me frustrated.

I decided that since I did not have the track-record of any major exit, I figured I was not gonna get an actual technical partner that didn't let me down.

So, I made the decision to become  technical. Past 3 months I have been at it learning all the necessary technologies, building lots of test projects along the way. My skills have came to a point where I have a strong grasp on everything I need, and I decided that I will learn the more specific knowledge when building out the project further. All the logic steps, wireframes, branding, etc have al been figured out from before, so I believe I can push forward now.

however, this time, I want to do it right. Since I learned most of my lessons the hard way, I wanted to ask this community, how do you go about finding a mentor that can guide you to the right way?

I am done getting a co-founder for now until traction hits again, but how in the heck could I go about finding a mentor to guide me on this?

I have been living frugally, delaying dating, etc. just essentially work/train/eat and sleep for the majority of a year and a half now.

I know that I won't be able to keep living like this forever, for my own sanity (although with more solid traction, I wouldn't mind)

I want to shorten my learning curve, and that's what led me to the concept of a mentor.

Anyone that can tell me how they found their mentor and what steps they took?

Much appreciated!