How do you build up on domain skills required for a business analyst?

Im looking for a career change and want to be a business analyst.

I have 3 years technical exp. On going through requirements of a bus analyst, I belierve I have all other skills like knowledge of tools, documentation skills, good language and communication skills, experience in liasoning wiht clients etc..

But one area where I lack is th edomain knowledge… how do I build up on it?

I am not very choosy about the domain im looking for…. could be anything, but I need a clear path as to how I can build my domain skills [my current proj is purely tech and offers no scope to gather domain knowledge].