Nice work! It looks like you are really starting to get the vibrato down! When it comes to vibrato in fiddling, think of it more as an embellishment. In classical music we use vibrato constantly on almost every note. In fiddling, we want to think of vibrato similarly to how we view grace notes. Use it to embellish certain notes or phrases. There are lots of different grace notes and embellishment we can add. If you would like more one on one help with that you can always find me here. One thing that will help your left hand be more nimble and accurate is if you keep your left wrist straight. Then as Ben said, focus on connecting your notes more. Try to think in longer phrases.
You are definitely off to a great start! Keep it up! Let me know if you have any questions about my tips!