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FirstPancakes suggestion is good for string crossings. Try to memorize the distance in how much you move your elbow up or down each time.

I can't see the contact point but it sounds at times like you are playing too close to the bridge. That gives a metallic, non clear sound.
I could see where you played pizzicato and that is the wrong place to pizz. When doing pizzicato don't pizz where your bow makes contact where the rosin is on the strings. The most common is to put your thumb on the edge/corner of the fingerboard and pizz over the fingerboard. 🙂
For intonation and finger placement, try playing mini scales with open string then 1, 2, 3 and a determined key. For example D, E, F#, G = 0, 1, 2, 3 with the 3 real close to the second finger.
I'm also guessing that you want critique since you asked about the string crossings. Some are hesitant to give advice because of discussions we have had in the past when a video is not placed in the Critique Corner section. We want everyone to feel that they can share a video without being critiqued though it's a great way to learn and get better. 🙂

Thanks for your post 🙂

Perfect 🙂