Beta Readers
The other day I was asked what the best way to find beta readers was. In short form, you have to network with other writers.
I found my first beta readers when I joined critique groups almost a quarter century ago. Some of those experiences were, at best, useless, so you should never be afraid to walk away from a crit group that exists, for instance, solely to teach ONE way to write, to knock down other writers, or, more benignly, is full of people who only get one genre, and it’s not the one you’re writing.