Only you know if you want to carry on hun but you have come so far already and have ploughed on despite set backs.
What about adverts in local paper, leisure centres and places with a healthy focus like health food shops, GP surgeries, chemist etc...
Independant shops like newsagents, greengrocers...would be easier to get to put posters up as opposed to big companies where you would have to go through HO.
Public loo noticeboards in places like bus/train stations? Lots have those advertising boards on the back of the loo door to catch your attention
..stil thinking...