Almost fully green- What should I do to stay "productive?"

If you have a training plan prescribed by a coach, I would stick to the plan it should progress in an effective and safe way.  If you are using a garmin plan, I don't have experience with it , but I would also stay the course.  The goal isn't to keep this Status metric green... there will be times of ebb and flow, and/or it is using HR only... which isn't the best metric (especially if not using a chest strap).  

High Aerobic is best triggered by strong workouts (not long runs)... MP is good for learning that effort and stride/pace.  For economy purposes... plus it is a high training load with not super high risk from wear and tear.  Personally I almost never run MP... maybe as a recovery half 3-4minutes "float" after a Threshold interval, to work on Lactate shuttling (processing Lactate at a high race pace).  Or a few at the end of a long run for MP experience and to maximize my aerobic effect a bit.  It just isn't a strong enough pace to trigger much additional physiological gains, but might/will... effect your hard Monday or Tuesday strong/hard Workout.  I like to keep long runs... long aerobic easy.  besides maybe fast finish (MP progressing to Tempo)... and/or a handful of short strides (15-30sec hard!)

I "high aerobic" is triggered very well and get a lot of training benefits from doing workouts around Lactate Threshold (LT) (hypothetical 50-60minute all out race pace), depending on the day or workout you can target a bit faster/slower or right at LT.   My typical marathon training is an early week Tue (faster or at LT) shorter Thershold intervals (At or 5sec faster then LT ~4x 7minutes, with 3min recovery jog) and then Thursday when a bit tired still something a bit easier but more sustained (MP-10 to LT+10 ) maybe 3x 12minutes with 3min jog between.  Can also do alternating miles of MP or MP-5s and MP-20" (or Threshold).  The idea is that you are getting plenty of time around your LT, which is often around 85-90% of your REAL (not calculated) max HR.  Depending on heat and day, you would in an interval or LT/Tempo run sit at HR of 80% for the start of interval but slowly raise up up up... over the course of the entire workout, so on the last interval you would be floating around 90-93% (depending on aerobic fitness and how your LT jives with MaxHR% (how much LT training you have done))

Of course eve3ryone has a diff opinion on trainig, so just my experience based on reading/research/myTraining.  (2:57 marathoner in 40's... started running in 30s as a 24-25min 5k'er)

Thanks.  All good general training advice.  I am a coach.  I’m working through a marathon plan right now.  
But I was kinda’ looking for how to ‘game’ the garmin system for assigning “productive” and “unproductive” or “maintaining” training status levels.  Like- am I just one wrong workout away from “maintaining”?  How would I know?  

Getting close- will I make it?  Got in that 16 with 12 at MP today.  

Garmin calculates the training status based on the moving average of your accumulated training load (TL)

Theoretically, it is how usually TL is calculated in other systems, however the way garmin calculates it makes is basically irrelevant for endurance sports, because the increase of the TL for a session decreases gradually and significantly over time: after 20 minutes, zone 2 runs does not really increase the TL, you can do it for hours.

The science behind this (again, theoretically) is called EPOC (EPOC | Garmin Technology), however, the implementation seems to be completely wrong.

Just skip it. Use intervals.icu, or other systems that utilize the data from garmin in a meaningful way.

I was sooo sooo close.  Maybe I can do another workout today to turn it green?  or is that it for today?  

"your a Coach" ?  Yet you are going after a 4wk Productive bar graph on Garmin? Not sure that is "Productive" training strategy.... is it?   Out of curiosity I looked back to this spring/summer before my June 1st Marathon PR (2:57)... there was not one 4wks of continuous green in that lead up months.   

I suppose if you went on a 4wk hard, 1wk easier cycle it would work out well, but I find there is some delay in bar data it seems a bit based on my last strong blocks (4-5wks green by chance).  That was after a period of 2wks much lighter training, so i think it made it easy to be green, but there was still a delay in green vs load increase.

I'll try to ignore your judgmental comment implying that you don't approve me me doing a less than optimal training program just to get a green bar.  this is just for fun, and fwiw I haven't from my training plan so far.  It's been going well, and I just finished a 3 week build which included my first 20miler of the cycle and then just this past weekend, a 16w12@MP.  So far, feeling pretty good and my training has gone really well.  and yet today, I wake up to "maintaining"- when I just finished my biggest week's so far?  dunno why.  Today is a rest day.  I did an hour of strength this morning, and my "maintaining" status didn't change.  I"m going to try a little on the bike to see if that makes a difference.  

And as for being a coach- do as I say, not as I do.  I vary from what I "should" do all the time.