Practice mental contrasting. Strike a balance between optimistic thinking and realistic planning by practicing mental contrasting. First, imagine your desired goal working out beautifully. Let yourself envision a total success for a few minutes. Next, switch gears and imagine all the obstacles that might arise.
Envisioning the obstacles toward achieving reasonable goals can make you feel energized and more capable of tackling said issues. If the goal is unreasonable, however, this exercise is likely to allow you to let go of that wish and instead focus on something more achievable.