I’d add removing inner resistance, which could be expanded under motivation in the formula. Increasing motivation isn’t simply an additive process — you can introspect on the things limiting your motivation, eg. fear of failure, and address them. After that, you have more cognitive space, and a difficult task might suddenly seem much more tractable. It’s about letting go of the thoughts/emotions holding you back. In my experience, tackling this has been most rewarding, not to say the practices in the article don’t help.