Lower Body, Core, and Hip Rotation

I need help incorporating more of my Lower Body, Core, and Hip Rotation into my pitching mechanics and wind-up. I am a 17 year old lefty throwing mid to high 80’s and just looking to work on some things to get a few more mph.

It’s tough to suggest something without seeing some video but I’ll go out on a limb and suggest getting your center of gravity (i.e. your hips or butt) moving forward sooner and faster than you currently do.

Alot of people say that before you follow through and when your landing foot hits the ground your belt buckle should be facing first base since im a lefty. This shows that your hips have not opened to early. Is this true?

Can you get some video up of yourself?

It’ll be easier to help give you drills that will be beneficial to you