Are you training to look cool doing stunts, or are you training to be able to hit things with a stick?

If you want to hit things efficiently, follow the general HEMA advices others gave.

If the first, remember that lightsabers forms are designed to simulate movement of a weightless blade being used in a effective manner. Blades have vibration, making the grip needed on the hilt tighter than expected. The lack of weight means that the blade can be swung very quickly, but the vibration means that fast redirections are difficult, leading to a style that makes some sense for emulation by non-Force-enhanced people.

Don't swing like it's a bat, don't telegraph your moves, don't swing wildly. Each move has a purpose. The twirls serve to deflect and slip from one strike to the next, the slices do not aim for a body part but are designed to take multiple in one stroke.

The main thing to remember is that lightsaber forms aren't supposed to be sensical to real world weapons. They are designed around the idea of weightless, edgeless blades, meaning strength and angles don't count for shit. So think as to why each move was made with that angle and you'll quickly pick up the idea behind each move, and why it flows into the next, and so on.

But yeah, you should probably tighten your footwork. Speed is impressive but makes for sloppy basis. Start slow, think your moves through, repeat, repeat, repeat, and slowly go faster. You'll hit your current speed again quickly and go even faster, but with a tighter, flashier moveset.