TBH, I think you could be looking at what your transferable skills (ie your selling points) from your existing job/experience, and think about who else might be looking for something like that. Don't get too stuck on the specific thing, rather think about how that set of skills could be applied in a different setting. For eg, it's unusual to have expertise in a type of software without having a whole bag of skills that would allow you to develop expertise in a different type of software. Are there other IT-type employers who you could market yourself to? What about government jobs (they are always on the look out for clever IT-savvy types, even if it's not for IT-specific roles).