Hi Andre. First, I liked the video quality and the camera perspective. Very enjoyable to watch. Gave it a thumbs up just for that!
Re the playing. Definitely better than most of the 3.5s in my league. You would win against most of them I think. So I think you'd be at least a 3.75. I think you would hold your own, and be competitive, but probably not win against most of the 4.0s and 4.25s that I've played in my league over the past several months. Maybe a couple you would win against though. Where they have an edge, and the reason I don't think you'd win against most of the 4.0+ guys is mainly in the movement area, and also your forehand slice approaches they wouldn't have done (they all have stronger forehands than what you showed in this particular video). Although you did come over the top and place a forehand or two rather nicely as I recall.
Your over the top backhand looks outstanding to me, a weapon. Seems like you have a lot of confidence in it. I really like your form on that. Serve and forehand seem fairly solid but not weapons.
It's really difficult estimating ratings because, for one thing, it's a relative (not an absolute) reference which depends entirely on your results against other rated players ... and the average strength of players in a certain rating category in a certain region can differ from that of players in a different region.
But for my league, tennisftlauderdale.com , over the past several seasons I would guess that you'd be no less than a solid 3.75 performer, and because of your generally nice stroke mechanics I would guess that you have the
potential to be successful at a higher level.
Oh, and you'd definitely beat me fairly easily, though I think I could get a few games off you. You say you were having a bad day in that vid? Well, for me that would be a pretty good day.
That is, I'm guessing I make more errors (of all kinds) on a good day than you do on a bad day.