I would suggest taking an entire weekend completely off (as in, don't even think about work) and focus on motivating yourself.
Take some time to reflect on the past. Think about all the things that inspired and motivated you to take the leap of faith and start your own business. What were you passionate about then? What were your dreams and goals? What did you think your business would look like in the future? Then, take a step back and reevaluate where your business stands in comparison to your initial goals.
If there's a lot of work to be done, then good! As long as you can still dream and innovate, then there's a solid chance that your company can grow to new heights. Never allow yourself to just "settle" for what you have now; that's how businesses become stagnant. Believe in yourself and innovate!