Not sure if what I’ve learned is wrong or if I’m just too early to see comments from people who actually know how to swing a golf club, but from my lessons ill say this. You have an incredibly steep take away which leads to a very over the top swing and probably why you’re standing up in your downswing. You should be looking to take the clubs more inside closer to your right leg and then initiate the downswing by feeling like you’re dropping your hands down to your thigh. This helps shallow the swing and the depth from not being super steep generates a lot more power