My first year growing tomatillos was not good either. Then I learned tomatillos are self pollinating, but they self incompatible...so they need 2 or more plants to cross pollinate.
I planted 2 plants the following year and I had more tomatillos than I could use in 3 years...there were so many the weight of them broke the plants, even when staked multiple times.
Try two plants next time, if you already had two...I got nothing
Thanks for the tip! I only did have one plant this year, and the tomatillos were the size of large blueberries. (kinda looked like blueberries too because they were purple) If I try next year I will definitely plant two!