Your question is way too broad to elicit useful responses. I assume you're talking about road races. So, my immediate question is what is the nature of the courses because the aerobic and anaerobic power requirements to be in the front group are quite different for flat courses versus rolling courses versus courses with long climbs. To win a road race of this length, the first thing you have to do is to survive all of the selection surges. Regardless of your aerobic power, the anaerobic surges will drain your anaerobic work capacity and if it's not high enough you'll be watching the lead group ride off into the distance after a few surges. And, if the course includes one or more long climbs, the climbs will certainly be selection segments. At your weight, you'll need well over 300W of aerobic power because you'll have 65-70kg guys with 300W of aerobic power and they'll ride away from you on a climb so fast you'll think you have flat tires. Finally, let's say that you survive the surges and are with the lead group at the finish. I don't know about the riders where you live, but my 5sec power is about 1200W when I'm race-fit and the only way I win a group sprint is if everybody crashes.
An alternative goal for the year would be to build a good aerobic base with lots of L4 efforts and after you have a solid aerobic base do some anaerobic and neuromuscular blocks to be able to define your race-fit power-duration curve throughout the duration range. With that info, you can target events best suited to your profile.
Finally, go to some of the events you hope to win and try to find a rider who was in the lead group at the finish and who is about your weight. If he rides with a power meter, ask him if he'll send you his ride file so you can see what it takes to be with the lead group. Some may refuse, but I'm guessing that most riders will be willing to do that (I would).