Enjoy it while you can.
We had no chiggers last summer in Texas, first time in my many decades of summers that I can remember not being chewed on. Didn’t even need OFF.
Why? It was so dry here there was no grass. Chiggers don’t live on bare ground or dead blades.
You’re probably just experiencing a temporary phenomenon.
No kidding. It looked like my back yard had been nuked. Harshly.
/johnny