This above exercise will help improve arch and metatarsal strength. Take a thin towel or folded t-shirt, and set it under one of your feet. Standing with your weight equally balanced; pull your toes towards your heel, scrunching the fabric. Repeat until you can’t do it anymore, and then do five more.
This one will haunt you forever. So standing on your feet, focus all your energy on the teeny, tiny, little mussels in your feet that you never knew you had. Isolate your big toe, and lift it. It might be slightly frustrating at first; but it will help you!
This one is mainly inner thigh, but I included it because it is also good for becoming intuitive with your feet. Take an exercise band, and tie it. Next, put your feet inside of it and slowly bring one away from the other. Really think about keeping your feet parallel, and really feeling resistance as you come back in. Do this 10 times on each foot. This exercise has everything to do with quality over quantity.
This is a good Achilles tendon stretch, calf, ankle, and quad stretch. Stand on a prop (stairs, phone books, stool, or whatever) and raise yourself to a demi pointe. You can do both or one foot at a time.
So this is kind of a humble-jumble of stuff. If any of it is helpful, and you want more (or different stuff, just let me know! I am always happy to give people stuff like thisJ As you are doing these, it is super, super, super important that you keep your core, and inner thighs engaged. Keep your body aligned. Happy Strenghthing!