How do I optimally prep for a 400m sprint event?

I’ve seen 2200 w on a power file before, just not mine… There, spike solved. Either way, I think you’ll benefit from a lot of race pace efforts, both in cadence (track specific concern) and in duration…

I’ve never raced track on the bike but I think Timothyh proposed a pretty decent workout regimen. Your recovery rate and ability to repeat the effort will determine if you’re underpacing or overpowering…

I’d consider a decent warmup experiment if you have 9 weeks - treat the first “effort” of each workout as a warmup, and figure out which of your efforts is the best, then plan your race-day warmup to slide that race pace to the effort…