"How can I improve my Tai Chi?"

In the most simple terms.......REGULAR PRACTICE !
...but not just once a week, in class......at home as well.

However, there are two common problems that get in the way:

Firstly, becoming over-dependent on following your teacher during practice in class.

Try to gradually reduce this by becoming more 'independant'.
Focus on whichever parts of the Tai Chi & Qigong exercises you feel you are enjoying,
then only refer to your teacher's movements when you need prompting.

Literally, 'feel your way'.

There is nothing to be gained from hurrying to learn any sequence as is taught in most Tai Chi classes.
Any Tai Chi form should be merely an expression of principles, regardless of any 'style'.
'Style' is irrellevant......principles are what matter and those are what's useful in daily life.

In learning Tai Chi, essential principles are far more important
than learning the choreography of a 'form'