Yeah, 4.2 is no mans land., sorry :). That said. You can enter a B a Race, since you don’t have a zwiftpower profile yet, you wouldn’t be considered a sandbagger. If your smart about using the draft, you should be able to hold the lead group and still stay within category limits. Once you get some experience, then dip your toes in the As. There are plenty of racers on Zwift who only know their FTP as 95% of their best 20 minute output in a race. And there are certainly racers who monitor their 20 minute power output to stay within cat limits. So I think you’d be fine for now, entering a B race.