How many artists can you think of that were cut down in their prime, or rendered incapable of creating their art, prematurely? I bet it’s a lot. There are legions of examples. Sudden illness, injury, misadventure or even death can strike anybody, at any time, without warning.
Those artists that survive, impaired, are often regretful at not having made more of their art, while they were still able to do so. Audiences are left longing for what might have been. It seems like such a tragedy. It is a tragedy.
You might not think your art is any good, but I assure you there is an audience for what you make somewhere, perhaps at some other time. The world survives and thrives on creativity. As a species, we hunger for it.
If you cannot think of a good reason to show up and engage in your art, then this is perhaps the most compelling reason there is. You aren’t going to live forever, or even retain your health and physical well being forever, so take advantage of that while you still have it. If your art is worth doing at all (and all art is worth doing, I contend), then do it for one reason alone, when all other reasons and motivations escape your consciousness.
Do it because you still can.