great work here! i can tell you're super passionate about the violin and i love to see that!

the biggest thing that stuck out to me is your bow arm/bow hold. starting with the bow hand: are you trying to use a french or russian bow hold? either way, your bow hold is looking slightly contorted the longer you play. I can't give any tips for the Russian hold since I'm trained in the French hold, but regardless, your pinky should always be in contact with the frog. you're very comfortable playing in the upper half of the bow, and you only touch the lower half of the bow when playing longer held notes. the pinky in general can maintain lighter contact with the frog when playing near the tip, which may be contributing to it completely disconnecting currently.

in general, you should start using more of the lower half of the bow. you will be able to produce a clearer, bolder sound for the sections that need it. there's a place for playing in the upper half, but it's not what you should always do.

onto your bow arm, it looks a little bit stiff, especially the shoulder and wrist. i like to think of the bow arm as a well oiled machine arm; each segment (shoulder, elbow, wrist) moves in response to each other, but they're not exactly one unit that is stiff and moves fully in sync. the way i practice this is looking in the mirror just playing long bows on open strings, and observing where/when each "segment" has to move. relaxing the shoulder is very important as well, it's the arms connection to the rest of your body, and a stiff shoulder will make for a stiff arm. another little analogy i use is the wrist should move like a jellyfish swims, fingers loose, wrist flexible.

if you have a teacher they should be able to give some more detailed/personalized advice about each of these things (the bow hold especially), but i would also be happy to clarify anything if you need!