How to get entity to go to blocks

So I used a tutorial which was for how to repel a mob using blocks and I got it to work were if a mob is near a block they should toward it but they only get repelled 

https://www.reddit.com/user/SaltFalcon7778/comments/y8pf9o/how_to_have_an_entity_go_to_a_block/?utm_source=share&utm_medium=ios_app&utm_name=iossmf