Need help on Smash Technique

You’re doing better than I was during my first year of playing, keep it up.

Footwork and racquet carriage are able to be learnt at home, you don’t even need a shuttle :)

Tobias wadenka on youtube had some 20minute “lockdown” videos where he practiced footwork etc at home. They were pretty good.

Keep in mind that if your body is moving backwards while you are trying to hit a shot it’s not too effective.

The panhanding you can fix with discipline. Hold the racquet in the correct v / universal / forehand grip to begin with. Then change it to a backhand grip, then back to a forehand grip and check it isn’t a panhandle one. If your shot goes off to either side when you are trying to hit it straight, it is likely panhandling.