Number of posts per day

Hello guys! I am back working on a health site project that I abandoned for a couple of months. My plan is to post 5 or 6 new articles per day, but I was wondering if it is the best thing to post 6 times on my Facebook page (3.5 k fans) per day or not? What do you think.

I have also noticed that my reach has considerably go down since 3 months back. Any recommendations about this?

Thanks in advance!