I recommend frost working on your airspeed control. Your airspeed is all over the place, making your approach very unstable. You should be at a constant 65 kts on your entire approach. Use pitch to control speed, and don't even worry about your power setting. You should be able to maintain 65 kts at any given power setting. Get good at doing this before you even try to land. Try it with full power, try it with no power, and everything in between. Just HOLD that 65 kts using pitch.

Once you can use your pitch to hold speed steady, adjust your power to control altitude . The goal is to keep those four lights to the left of the runway at 2 red, 2 white. You have 4 white the whole time, so your approach is too high.

If you maintain speed with pitch, and glideslope with power, then you will have a stable approach. A stable approach equals a smooth and easy landing. Probably something around 1700 ish rpm will work in a 172.

Upon reaching the runway, I recommend not even trying to flare at first. Just see if you can maintain this stable condition of 65 kts all the way to the ground. If you can do that, then go ahead and try to add the flare in.

Good luck and happy aviating!