You can buy Ladybugs at your nursary. I always buy a few bags every year. Spray the wings with soda and they cannot fly away for 2 days. The munch everything for two days. Then most fly off. But always see lots of ladybugs after that. Or let some out little at a time. Keep them in the fidge and they will go into stasis. Take them out and few minutes later there eating.
I picked them up for 11 bucks for 1500 ur local nursery should have em or even some home depots carry them as well.