I assume you've already done so based on a few of your word choices, but if you haven't already, I recommend checking out Peak [0], the latest (2015) work by Anders Ericsson. He's the researcher who came up with the "10,000 Hours Rule" as popularized by Gladwell. I thought the book had useful suggestions such as how to make sure you're achieving deliberate practice, how to get better when you don't have a coach, or what do for yourself (or as a parent for a child) when considering quitting an endeavor. Ericsson also shares reflections on what folks mistake about his research (i.e. 10K hours was merely the mean for one of his studies.), while clarifying the approach you SHOULD take as supported by his research.
[0] https://www.amazon.com/Peak-Secrets-New-Science-Expertise/dp...
For some context, I read in the book "Peak" by Anders Ericsson (who is credited with the 10000 hour rule) [1] that cab drivers in London who passed the cab exam literally rewired their brains during the process of studying and it could be observed in the brain scans. (But also notes that they unfortunately lost some spatial awareness ability which the average person had)
[1] https://www.amazon.com/Peak-Secrets-New-Science-Expertise/dp...
See https://www.amazon.com/dp/0544456238/Peak and book summary here https://www.samuelthomasdavies.com/book-summaries/psychology...