Networking is pretty tricky and most of my network is actually online, which has bugged me for a while.
The thing you touched on here that I think is really important is to just let people know that you have these skills. Because opportunities can come from really unexpected places. The first time I got the chance to illustrate a book was when I worked in an office. I had the habit of doodling on a big whiteboard as I discussed job stuff with my colleague. And this turned into one big drawing over the entire whiteboard, people saw it and suddenly someone I hadn't met in the organisation came up and asked if I wanted to illustrate his book.
And this year I invented my own drawing challenge, #catsofjune, where I just drew tons of cats for a month. It was mostly to break through my artist's block, but to my surprise it actually gave me job opportunities when people saw these cats.