Doing things yourself can be a fun challenge. To be able to discover the paths of a new career or hobby is a fun process. But like everything we explore, we sometimes reach a point where there seems to be nothing left to discover. Reaching a plateau in what we pursue to be great and what we practice feels like we're falling behind if we're not advancing beyond that point. The reasons we have schools and courses is not just to learn about the content. It's also about the teacher who helps you understand the concepts. Every great master started off with a teacher or mentor to enable him or her to reach their full potential showing you knowledge that took them probably decades to understand.
“Go beyond the beaten path”
First thing we need to know is not everyone needs a mentor in the classical sense of the term. There are tons of books and courses online you have access to if you need a quick solution to a mentor. See it as every piece of information being a peek into the the writer and teacher's mind. Having books around and learning on a daily basis will definitely help you fill the gaps in your journey of learning. The only drawback is the obvious no contact with the mind your tapping into. But it is the fastest and cheapest way to access the information you probably would have taken your whole life to figure out.
The hardest but most beneficial way would be to have yourself an actual mentor. Someone who you can see on a timely basis and pick their brain. Of course most are not available in this way but with a lot of perseverance you can eventually be under the wing of a great mentor. Just remember how much your willing to give and learn. As you attain new knowledge think of ways where you can be a benefit to them as well. Become an asset to their life. As you receive always be open to create actions that benefit him or her as well. That way they'll be glad to have you around creating a mutual exchange in companionship.
“There’s always a back or side if the front door is locked”