I made massive gains on the bike 2 years ago, when I was off running for 3 months due to injury.
As long as you maintain your base fitness, the run will come back fine.
Tour de Zwift starts on Jan 12, great way to improved your FTP
Iām quite a fan of it myself! Plan on doing the same after this season 
Building back up. Last 4 weeks maintained with work/Christmas, ready to start building again now for next few months.
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What I āloveā about TP, is that last night I get back to 93CTL, then wake up this morning to 90. So yesterday was 4 steps forward, then 3 back today 
I guess the nightly drop-off is less if youāve got more volume on the books in the preceding weeks.
We will see who gets injured the quickest in 2020.
HINT: Those with the highest CTL/ATL in December 
This reminds me of someone I saw on Strava, who was smashing out 100 mile rides in February and March, at 20+ mph.
Then recorded some pretty monstrous 4-5km swims at <1:40/100m and 30-35km runs at <5:00/kmā¦
ā¦come race month they were injured and had to pull out.
Ultimately, in your case; your volume/CTL is only supressed due to inconsistency, not a lack of actual training.
I donāt think Iāve done any actual training for a while nowā¦maybe swimming, but the running and cycling took a back seat. For speedy run sessions, I have to look back to 29th October for my last actual speed work session (5km progressive) [parkruns excluded]
I only use the power meter on the bike to keep me around 65% FTP, which is solid Z2.
Itās semantics, but you could class lower intensities as ātrainingā your body ready for the more intensive periods to come, or simply ābaseā. As you ādetrainā over time, so that lower intensity/pace becomes more like the ātrainingā you allude to too.
Or I could have just said, youāre not exercising consistently. You Millennials are so pedantic 
Well your latter part of the year hasnāt been consistent has it; one big peak block, but very low either side.
Lines drawn purely for demonstration purposes. CTL demands consistency if you want the number to be stable and high; for better or worse.
Up over 365 days so all good!
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Also note the massive swings to swim, bike and run.
Even training between them isnāt consistentā¦
ā¦butā¦it hasnāt done me much harm at all!
Most rides I am doing now, I am doing Strava PRs all over the place.
I PBd at my local parkrun on New Years Day, after running one 70 minutes prior?
It would seem as though my body craves different things
same as mine
crisps and biscuits
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Wine one night, beer the next?
exactly - keep the body guessing!!
Liver and Blancmanche?
Actually did āspeedworkā tonight 
A massive 6 lots of 400m on 90s (3:45/km)
Headwind wasnāt nice, but Iāve found a well lit section of road that has a decent path to see me through to daylight in the evenings 
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Iāve run two days in a row.
Garmin tells me Iām overreaching!
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I think your body will thank you for this decent break, and mentally after quite a few tough races this year.
At your age it wonāt take long to build back up.
Jeff
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After much faffing and avoidance, yesterday i finally completed the critical power test set out by Coach. Iām such a pussy. The reasoning behind the test was to find my Wā number. God knows what that is, but apparently iām 13kj which is below average. This is terrible for my Ego! I think itās something to do with the amount of energy in reserve for hard all out effort. Anyway, future training will now reflect the need to improve this. FTP lies at 313, which has dropped from 330. All good though, iāll take that at this time of the year. But below average, WTFF!!!
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What do you weigh?
Absolute watts are meaningless!