Great question! Sometimes motivation is harder some days than others. For me personally, I love creating the content. I love creating a piece of art that I can be proud of. Of course I love the recognition when its received well, but that's not something I rest on. I teach a lot in my videos to improve what you can improve about yourself, I feel that's just like life. If you create videos looking for likes, comments, etc to feel good, then your happiness and motivation can be very volatile. I've had plenty of flops, and they don't get to me that hard because while the good comments make me happy, the bad ones don't affect my motivation personally.
As for what do I hold on, what is my goal that keeps me kicking? Freedom to do what I love. Freedom to be able to go wherever, do whatever(within reason), and not have financial stress because of it. The 9-5 used to be the American Dream, now I believe its not. I think the dream is being your own boss and having absolute freedom.