[impendia]

Very good question.

This is difficult. One way to do this is to participate on Math Stack Exchange:

https://math.stackexchange.com/

I'd recommend not only asking, but also answering others' questions. It's not the same as having a group of people that you regularly talk to, but it's something.

You could also hire a graduate student tutor. For example, here is a list of math grad students at the University of Wisconsin willing to do this:

https://www.math.wisc.edu/tutors

An hour every two weeks would go a long way.