Can someone explain the process of doing L1 LiDAR PPK? What do I do with the Raw File from the Base station? How do I make DJI Terra read that file? Can someone explain me their workflow? Thank you.

Also,
I have a very large site to fly with LiDAR about 10 square miles, do I keep the base station at the same point? And do small flights since the lidar needs to recalibrate every now and then?

You need RINEX data from a base station. You have to put them in the file that comes out of the SD card. If the format is good, Terra will do the rest.

Half an answer. The other half is that you only want the 22o file and you have to rename it. The filename has to be the same as the RTK file in the job folder, but with the suffix ".obs". Then Terra will recognise it and use the RS2 base data for PPK processing. BUT ... it will only PPK process the lidar point cloud, not the images. This is a major weakness in the whole L1 workflow at the moment and DJI need to fix it.

If drone RTK is
DJI_20220323135678_005_Zenmuse-L1-mission.RTK
Then your base station obs file must be inserted in the same folder as
DJI_20220323135678_005_Zenmuse-L1-mission.obs

Emlid RS2 or Trimble etc .. can  be used as a base