Congrats! I was stuck around 25 for a while too. Then stuck again at 50, but I did notice my sales start to go up when I reached 50, now I'm at 80 and stuck again :P I'll eventually make it to 100... I'm in my 4th month of selling on Etsy, 50 listings took me about 2.5 months I think.
Tips, work work work work.. that's all I have >.< Sorry. Don't try to rush it, items take time, in the meantime just promote your heart out. Hopefully promotion will lead to sales, which leads to money, and the ability to buy more product inventory, finally leading to more items :)