Jeez man, you are a fledgling compared to me!.
I’m 64 and been a runner and cyclist all my life. I started on TR in March, and have never trained so consistently ,and had used HR, not power as a measure. I also did not like training indoors.
Now I’m the opposite, I train with power (smart trainer Cyclops Hammer) and i hate the cold and wet…
I raised my FTP by 15 2 months ago.
And now I’m working on my sprinting. Ha ha it’s non existent ,but i have faith in TR 
You have lots of potential for improvement.
You don’t mention what plan you are doing on here, and whether you race ,or ride for fitness, but with the right consistent training you will improve.
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