Resting HR has nothing to do with this.
Have you read this article https://uphillathlete.com/when-to-add-intensity-training/
It should answer your question. If not let me know.
You might also want to read this as more accurate way to determine your AeT https://uphillathlete.com/heart-rate-drift/
The best way to find your AnT is to a field test as explained here https://uphillathlete.com/diy-anaerobic-test/
I hope these help