You will find that there are 100 different opinions on this subject.
Leveling a lawn is not an exact science, but these videos summarize Allyn's approach:
https://youtu.be/bi5PFME699U - Leveling The Lawn 2022 - A Different Approach
https://youtu.be/NleJWDAfZ3k -Leveling The Lawn The Easy Way To Smooth Out Bumps and Ruts In Your Home Lawn
If you are going to level the lawn in spring, skip the pre-emergent. There is also no need to de-thatch or aerate prior to starting this project.
If you prefer, you can also get this podcast on popular podcast apps:
Google Play: https://goo.gl/ufvZYg
keywords: reduce ruts, bumps, flatten your lawn, St. Augustine scalping, level lawn