I also found last month's sales exceeded this month's, but both have been better than I ever used to be, with nearly triple the sales I was getting in the early months of this year. I am convinced there are 3 parts to this:

(1) having lots of listings (in the 100s if possible)

(2) having listings up for extended periods (up to one month)

(3) having items in a broad range of categories (mine are distributed over 11 major categories)

I know (1) is entirely due to the offers of 150 free listings, whereas I only used to have 40.

I know (2) is due to the three free relists

I know (3) is due to my own hard work.