Looking for some suggestions as far as what a long term, general training plan should look like.

I'm 6', 193 lbs. Racing cross at the moment...finish generally middle/front 1/2 of races. Middle of the pack, maybe slightly better. I'd like to move up from cat 5 to cat 3 next year, which I think is possible if I drop 10 pounds and gain 10-15% power.

I've got a smart trainer with power/zwift that I'm starting to use over the winter. Any general criteria for setting up a plan over the next ~ 9 months to get ready for 2019 cross season?