Be mindful of the Distraction Effect when there is a complex task at hand, and approaching challenges with mental contrasting if the most practical way to achieve.
Another key motivation tactic is to focus on aligning fun/play with your goals since passion ultimately is what keeps us most engaged.
AsapSCIENCE. (2016, Jan. 7). The Science of Motivation. [Video File]. Retrived from: https://www.youtube.com/watch?v=pZT-FZqfxZA