Keep your TT bike on the trainer.
Especially through winter. That way you ride it frequently and it’s not foreign when you start riding it in prep for races. You need / want to be able to perform on your TT bike in races. This simple tip and the familiarity that comes with it will go a long way!
If you can get on the road year round then by all means, do so! But mix in the TT bike year round too.