people often try to find the 'best' mentor they can in hopes that they will be spoon fed all the information they need to know to improve at the game but unfortunately it doesn't really work like that, at a certain point you have to look at your own mistakes and learn on your own
as others have said there are so many good resources out there at this point that you can easily get the basic fundamentals down and work on specific set plays and coordination with your team, a lot of plays that invite mentors may tell you to do won't even work on a lower level team because of the lack of coordination
edit: another point to understand is: there's no money in this game, in all honesty nobody wants to spectate your open level scrims every night and give you tips, why rely on someone else's commentary anyways? only you can find what works best for you and your team, you can't rely on someone else to make you improve