I listened to your piano improv, and I thought it was pretty good. Thing is, I'm not that good on the piano myself, so it is difficult to give advice to others, when I need advice myself.
That said, BruceD and PianogrlNW gives good advice on your playing. You've got good potential and a good personality and some charisma, which always helps. I would suggest to give your improv tune a name. Call it something, anything, but give it a title. It is your improv and your work, your creativity and your performance.
Also, I'd suggest that you keep practicing and try to make your playing smoother and less choppy, unless you're playing some hot boogie-chops.
Also, again, and this is just a thought, I would suggest that you NOT ask viewers to subscribe to your YT channel. When you ask for subscribers it is like you soliciting your audience/viewers or trying to sell them something. If they watch your video, and like your playing and your music, that means they like you, and they will subscribe without you having to ask.
Otherwise, keep up the good work!