Attack when registering online.

Velodrome's a different animal from the road unless they are letting you race geared bikes and you're racing for an hour. Tactics are fluid and malleable; what may work in one situation with one group of racers might not work with another. It's a beneficial to learn your opponents strengths and weaknesses as it is to know your own, in some cases it's more useful.

Work/attack only when it's in your wheelhouse and the other racers are having to do as much or more; an example is if you're a skinny climber, attack on the hills, not on the flats into a headwind.

Try different stuff. As you keep racing your power profile will change as you get fitter and your toolbox will be bigger. Of course so will everyone elses.