I don't draw daily, but I have been working on my comic for 2 years (yes, my first upload was August 2021 but I've been working on it for a few months before that :P), which is the longest I've stuck with a project. And I'm confident I'll be able to stick with it for many more years after that. Why?
Because I strongly feel that my comic needs to exist in the world. It carries messages I want to shout from the rooftops. I've scoured the net far and wide for other stories that say the same things, and was left wanting. Even stories that address similar themes aren't approaching it from my angle, addressing the nuances I want to emphasize.
I'm not 100% motivated 100% of the time. But I think it's okay to have lapses in motivation. I can drop it for week, month, even years, but as long as I'm still breathing, I can always pick it back up. And as long as the story still matters to me, I WILL pick it back up.