How to transition from ID to another discipline? Arch? UX?

^ KayKim (from Seattle right? hope all’s going well), good words there.
I agree with the rest, enter competitions, take two-week projects, meet new people, get out there. The thing to realize is that you are at this point, a one-man design team with your one-man marketing team, offering companies your value proposition. If you can find a company that you can bring a lot of value to, and you can convince them of it, I’m sure they will hire you.
Funny thing, I know quite a few IDers who have moved to UX design.