i offer paid and free mentoring (free if you work on my own projects, most of which are FOSS).

i don't know if i have enough experience C++ to be a good guide for you. it depends on what you expect from a mentor.

i recently worked with a student learning rust, without any rust experience on my side. i helped the student to structure the program, while they had to explain to me how certain rust constructs worked. that had the effect of the student having to explain what they learned about rust, which is a powerful way to increase their learning. (if you want to learn something, try teaching it to someone else)