Great to see your take Rhida!
First of all, I'd like to suggest that you don't play the A chord using that fingering if its not comfortable for you.
It can be hard to fit in 3 fingers in there!
I prefer this one:
Click to view attachmentYou can also fret all three notes by barring the index finger like Ben does in this lesson :
link (check video part 1)
___________
Timing in your performance is shaky but the good news is that it is not your right hand. It is mostly related to difficulty changing chords with the left hand. Try practicing with a drum beat or metronome just the problematic changes. For example going from D to A. Here is one of my lessons which has drums only backing tracks in various tempos, you could use them for practicing changes (you can play the same rhythm as in this lesson for example) :
link to the lessonThe timing will improve as you get more comfortable switching chord shapes.
My suggestion would be to first focus on the fretting hand and chords switching and once that is in place, add the right hand rhythm and focus on it. Note small details in Bear's performance like when he stops strumming at 0:15 (on the D chord).
Last but not least, try adding a hint of overdrive to your tone to get a more similar tone to Bear's in the lesson. It helps glue the chord notes better and make them more rock sounding.
See you in the next REC take!