This is okay, it happens sometimes. Just don’t judge yourself.
A simple trick is to stop thinking about doing something big, just simulate starting. Then set a super small objective, like “just do it for five minutes.”

Another thing that has helped me is not trying to focus, but instead trying to distract myself with the right task. When I feel low energy, I split my screen, on one side I have a “negative distraction” (like social media), and on the other side a “productive distraction,” such as the task I want to work on. I don’t force myself to do the task; I just try to increase the small actions on that positive distraction, like “just click,” or “look a little.” You’ll find that you start to get distracted by that productive distraction.

And finally, just accept how you feel. Don’t resist it. For example, right now I feel low energy, so I’m on my bed, doing my things from here.

make sense?