Add track context so you can clear a players track progression.

You can set them to the first rank of the track. And contexts are considered when using commands to modify a players track position (demote, promote and parent settrack)

You can clear track progression using https://github.com/lucko/LuckPerms/wiki/Command-Usage:-Parent#lp-usergroup-usergroup-parent-cleartrack, or the settrack command to reset to the first position as Brainstone said.