Welcome.

I’m pretty new here too but I never post. I’ve been playing 30 years. Can’t possibly explain how much Pebber’s videos have helped my technique. No one else responded so I’m stepping up. Maybe they’re all really invested in the election!

1st I notice your body position... your bent sideways with your neck cocked. That’s gonna get painful long term. I recommend you try to concentrate on sitting straight or even standing. Then you need to tilt the neck up to bring the fretboard to you instead of trying to bring your whole upper body down to the neck.

About your picking exercise. It looks more like you are picking with the flat side of the pick with your wrist parallel to the strings and using an up/down motion with your wrist. I’m getting tired just looking at it, your wrist must be exhausted. I recommend rewatching all Pebber’s picking videos. Your wrist should be at an angle across the strings |/|||||. Your pick grasp is pretty close to right. Clutch it with the thumb and index finger only. Use the strength of the thumb to push the outside SIDE EDGE of the pick away from you to pluck the string. Then use the strength of the index finger to pull the INSIDE EDGE of the pick back in towards you. The wrist should be completely still and only the thumb and index finger should be moving back and forth. First concentrate and getting the string to ‘pluck’ so you get a decent sound then you can practice the motion until it becomes thoughtless... then you can practice changing strings while you count to 4 :)

The spider exercise looks pretty good actually (thumb is up!)but I would slow it down and concentrate on lifting the pairs of fingers at the same time and landing them at the same time. As you change strings move the thumb behind the neck a little bit so it stays directly behind the fingers as they move.