My advice for you is, watch some video of bass players having fun on stage! Watch their posture, how their bass is slung, what they are doing with their left hand, their right hand, their thumb, their fingers. I like to study successful bass players who have had decades-plus careers. Tina Weymouth. Adam Clayton. Sting. Paul McCartney. John McVie. In particular watch some players who are similar to your own size and body type. Each player has a slightly different approach to the instrument, and we can learn something from them all. Who are your favorite bass players? Learn some easy and popular bass lines, that you can play with one finger on your left hand, and have fun! When I was first learning, I spent hours playing along to U2 videos. Which bands excite you like that?
If you are looking for specific feedback on your video, great progress for one week. My suggestion is, don't use each finger individually on its own, those are your smallest muscles. Remember my analogy of trying to open a drawer, or pull open a doorknob. You get more power and less fatigue if you stay loose and use your larger muscles: elbow, upper arm, shoulder, torso, core.
When I am fretting the strings on my bass, I like to imagine I am burping a baby. When you burp a baby, you do not pinch it between your finger and thumb, like a lobster claw! Rather, your thumb stays neutral, and all four of your fingers move together in a soft and gentle motion. You want to touch the baby with soft hands. I think of it as giving my bass a gentle pat on the back or slap on the rear end. "Attaboy!" Hit too hard and it makes an angry racket! But caress those strings just right, and people will say, "that is some funky bass playing!"
Whatever else, though: play along to your favorite songs and videos. If you know any friends who play music, get together and jam. Have fun!