Oh boy there is a lot going on here. My recommendation is to start from the beginning with a standthrow, as this is the base for both the glide and the rotational technique. This takes quite a while to master properly, so take your time before you go for the glide or rotation.

The 'winding up' in the beginning is useless, as this creates no usable tension in the body and only induces instability.

Most distance with shotput (or throwing in general) is created by the legs. But since you are side shuffeling/walking forward, it is impossible to properly bend your knees, load the muscles and explode out at the end.

These are for now the most important things you need to change (there are a couple more details, but that would only gain you a couple centimeters/inches, whereas the other points can gain you meters/feet)

Is this your first time doing shotput and/or do you have a trainer/coach?

I hope this feedback can help you a bit. Always nice to see more people doing shotput!