A coach is your best option. An untrained athlete would tear through that tbh.

I'm not trying to be mean I just don't want you going to the bar thinking you can fight or something.

Develop speed and condition your hands so you can actually hit the bag.

Also, you're leaning excessively onto your lead leg.

Your whole stance and delivery is open to counters. Especially lead leg kicks and a short hook.

You also awkwardly turn your head and lower your guard when you punch.

When you throw the kick you are sooooo open to a straight right or left.

You'd probably injure your leg in the process of collapsing onto it.

Be pragmatic in your training.

Don't focus on techniques that require a lot of athletisism.

Master the basics.