It's hard to overstate the impact of positive thinking. This simple practice requires very little effort and can create a whirlwind of beneficial outcomes.
Think of your mind like an efficient clerk. Ask it for reasons to feel upset and it will find them. Or, ask it for positivity and it will find that too.
With so many big goals and obstacles in life, it's easy to lose sight of the day to day wins, but these are important milestones for progress and positivity!