How to Raise Your Threshold and VO2 Max

The elite Nats road course is a really good example of you know or like any kind of hilly road course it's gonna be a lot of over threshold efforts right so if your threshold is let's say 250 watts and you're doing these efforts you know a couple minutes at like 300 watts the question becomes what do you train now? Do you train to raise your threshold because if your thresholds to 80 instead of 250 now you're only doing 20 watts over threshold now it's a much more sustainable effort. Can you train yourself to ride more over threshold why not both no literally though well excuse me when you actually train to ride over threshold you get a lot of improvements real quick and then they