You should be approaching galleries, entering contests, and doing whatever it takes to get your work seen by the public.
2 things to remember:
1- the work can't sell if it's sitting in a box at home.
2- If you're in a venue that gets 500 visitors in a month, you only need 1% of the visitors buying your work to get 5 prints sold.

Your cyanotypes are wonderful. They will find a market.