interview for open positions. ask your friends if their companies are hiring. be honest, tell them you want to transition.

but ... i mean, if you can't sell yourself into a job, you're not going to be doing much sales.

As someone with basically zero talent for salesmanship, from my outside perspective I'd describe the sales process (and thus the process of getting a sales job) as anticipating, identifying, or manufacturing a need in someone, and positioning yourself to fill that need. So I imagine the parent commenter could use that to decide if/how to transition to sales.

that's marketing + sales but yeah, a small organization 'sales person', or an above-median good one that works in a large organization will have to understand (or even do) both.