If the bike is still relatively new to you I think adaptation is probably the biggest goal. Time in the saddle first and then move toward tempo/SST work. It is also valuable to do shifting cruise intervals in late base especially if you have been inside for most of the winter. Shifting cruise intervals would be something like 4-6 sets of 6-8 minute intervals where you do 60 seconds @ ftp and then 30 seconds at CP30. I can't remember the exact recovery period, but I think it is 3-5 minutes.