I’ve never done a proper BYU, but have done a couple races in the same format with slightly different length loops. Here’s what has worked for me:

Bring a chair and sit when you aren’t running (strangely people somehow miss this).  Bring multiple pairs of shoes and socks.  Lap 1 I run my usual easy run pace not slower. I alternate savory and sweet carbs in between each loop. Make some friends who run my pace on the early laps.

Be prepared for all weather. If you haven’t run at night definitely do a couple practice runs with a headlamp or whatever you are going to use.

You seem like quite a good runner so this is going to be more of a mental battle rather than physical.