Because sometimes we forget why it is that we started something, try to complete the exercise below. Those reasons for doing can be important motivation. When you're done completing the exercise, keep it in a place where you'll remember where it is. Maybe stick it in a journal, or to a mirror. Hold on to it as a reminder as to why it is you do what you do.
1) The reason I [insert activity here e.g. Write] is because:
2) list some things that you would like to accomplish with [insert activity here e.g. Drawing]:
3) What would it be like if you could never [insert activity here e.g. Sow] again? If you couldn't accomplish what you set out to?
The answers to the exercise above should give you insight into some of your motivations but also how what you hope to accomplish might not be in line with what the reasons were that you started in the first place. That last question can help you sort out your priorities.
Creating is wonderful. It's time and energy consuming. Advancing your skill can be tiring if not even painful... But creating is wonderful.