Calling coyotes is rewarding. Look at all other game and they have a weakness you can exploit. Yotes can, hear, see smell better than you and they are smart. It took me a long time to get a successful stand. But after you get it to work a couple times you'll learn why it worked.
They always try to get down wind of your caller. And they almost always stop and look back on their way out.
Keep trying and good luck.