It doesn't have to come from someone else to be worthwhile. Include celebration as part of your personal management strategy. Set short-term goals and reward yourself when you complete them, rather than waiting until you finish the entire project. You don't have to wait till someone buys it. Each night before bed, write down at least three successes you had that day, however small.
Many people find that the inner, intangible successes are the ones that really matter.
You can also review your journal when you're feeling discouraged to renew your spirits. Toast your success. Enjoy their enjoyment of it. Perform your work or let it be the centerpiece. For example, create a gratitude ritual.