How do you gets get to getting stuff done when you have low energy or can't concentrate?
I look at my available contexts and pick actions to do that don't require whatever form of energy I am low on either physical or mental.
For example the rams broke out and got mixed in with the ram lambs before coffee this past week. After the physical sorting I needed to do to get everyone back where they belonged, and fences repaired I was not up for the physical work of actions still in the context of "Outside by Myself" I had on my list. So I came inside, changed my context to "LambTracker" and got some database updates completed. I had mental energy but no physical energy.
Conversely, a few days ago I had spent nearly 5 hours straight working on a particularly persistent bug in LambTracker. I was getting nowhere. So I decided to take a break and looked at the outside context. I went out and got a bunch of electric fences moved and set up for the next sheep grazing move. I didn't have to do it then, sheep still had plenty of feed where they were, but I had zero mental energy to work on LambTracker problems and needed to get up and move a bit so I worked on ones that only took physical energy.
When I just want to procrastinate because I'm rebelling against work at all I have another tactic. My action lists also include all the fun and hobby things I like to do. Yesterday I'd been working on stuff all day, a combination of both mental and physical things and and I just wanted to stop and relax. I took a look at my current knitting project plan in my list manger under the context "Inside by Myself Hobbies" and see that there is a next action to knit a gauge swatch to set my gauge for a replacement winter hat. It's fall and I know I'll need the hat soon. So I grabbed my knitting bag that had all my tools and the yarn. My yarn was already spun, that was a previous action for that project. So I started the gauge swatch and got it almost half done. I didn't check off the make gauge swatch action because it's not finished but I made progress and when I next want to or need to take a knitting break I can just pick up the bag and go.
Sometimes the best choice is take a 15-20 minute nap. if I'm dithering between what context to move to or what has priority or what I can do with the time and energy I have but it's not the same as procrastinating on finishing some specific thing and it's not that I just don't want to do anything I usually stop, go drink a full glass of water and lie down for a 10-15 minute nap. I know that will refresh me and I can then pick up again and probably actually get something done.
So I use a variety of techniques to get me moving forward.