Pls feedback on my swing

My 7 irons can only go 100M and use to top the ball. From the video, I can see my left foot lifted. I find my arm is not extended,

Which iron were u using? 7 iron? your right knee locked at the top of your take-back. That is a no-no. Not enough weight transfer. Maybe need to activate hips more. but that is just my comments from a half-baked golfer.

advise to see a pro to get more professional advice. alot of pros here on the forum offering free swing analysis sessions.

Thks for your feedback, I am using 6 iron. Will try to change the swing. Can I summaries the swing pattern on down swing--> hip turn-->shoulder turn and bring the arm along?

Henry, lesser is better. Simple swing > complex swing. Right now you have too many parts moving, makes the swing difficult to repeat.

Rotate about your spine and weight shift will occur naturally, right now you're swaying right, and swaying left. Hard to repeat, a lot of timing to take note of.

But I like that you dare to swing i.e. swing through your shot. Must not slow down around impact.

Yup, like MC said, seek professional advice, we can only maybe tell you the macro of a swing, the micro and mechanics is known best by pros.

Best of luck my friend!