Well, as you probably know, theatre reviews in newspapers, magazines etc. are becoming increasingly rare, and the job of full-time "theatre critic" is basically obsolete at this point. However, if you really want to write about theatre, academia may be for you...I am currently getting a Ph.D. in theatre if you want to direct message me and chat about that sort of thing.
As far as more administrative theatre type positions go, I would recommend going to the website of every theatre organization you like/admire/would be willing to work at and emailing the appropriate person your resume. Non-profit theatre companies are always looking for people to help out. You'd probably start with something rather thankless, but could work your way up and explore possibilities from within.