See what you can get by putting some subtle feelers out. Talk to a recruiter or two. Best time to search for a job is while you have one, but you don’t have to commit to it full time unless shit really hits the fan. You’re more likely to get written up than fired initially anyway if he’s not the owner, erratic or not he has to answer for that.

Continue working towards whatever certifications you want in the meantime, especially if the job pays/reimburses you for it.