Only own 1 SF video and no experience with the current plans. A little over twice your age, back in 2015 I got to ~250W ftp just by doing Tue/Thur HIIT in a gym spin class on Stages stationary bikes (with power meters), plus another outside ride or two. So that was about 4-5 hours/week. Then next bump in fitness was a result of increasing time on bike plus hard group rides, and that took me to ~280W. Then bought a Kickr and after an off-season break the TR sweet spot base along with some outside riding would get me back to 240-250 ftp. And then like @JT_34 the TR build plan destroyed me. Based on that, I’d recommend going with low-volume build plans and potentially only doing two of the three depending on how you feel. Given that experience, I bought some different plans (FasCat, Velocious) and discovered I needed a lot more zone2 than in the canned TR plans (broke thru 250 ftp and hit 260 in June). So IMHO it really pays to discover what does and doesn’t work for you.