And the corollary: write down what you have done. It can be (for me) hard to remember, giving rise to the mistaken feeling that you’ve achieved nothing.
It's a big motivator and important tool I've picked up.
The best part of the bullet journal method is the de-prioritizing of tasks. I don't give up on things to the point of detriment. With a bullet journal, I've learned to let go of stuff and move forward.
I have a kanban/whiteboard with small post-its and the "done" column is a reminder that things are being completed, even if not always at the pace I'd like. Not so much a hack as a reminder to not be down on yourself - we can't all be hyper-focused life hackers :-)