Replying to Upping range of motion and poppiness

Ive been stiff as a board for most of my life and didnt realize how much it was holding me back in skiing til i started stretching regularly. My stretching routine now mostly targets the hammies/calves/groin before my standard leg day routine but i still feel like i could be doing more in the offseason to up my range of motion. Im also fairly heavy footed and want to change that to up my swap game. Ive been seeing generic shit online that address both of these issues but im hoping to put together a routine thats oriented towards skiing. What have you guys been doing to improve your flexibility and get quicker on your feet?