Discipline Selection

Looking for advice. I have a marathon XC race coming up in Feb. and March of 2023. The race is called Snake Creek GAP TT. I currently have it plugged into plan builder under Marathon XC race, however this race has a lot of climbing 7200 ft over 50 miles, all single track and technical.
Is there another category I should consider?

Thanks in advance for the help!

I would stick with Marathon XC. Just make sure you put in a realistic duration and intensity. As it is all single track and technical, I assume the climbing will be broken up vs. a 1+ hour climb, so Marathon XC will give you the right training for repeated shorter efforts. I did the same for PCP2P ~77 miles with 10k climbing.