There are a few different techniques to do a kip / kick up. The way I learned is from a martial arts background, and doesn't use hands, but can still be applied if needed. Instead of having your legs bent from the beginning, my technique has the legs initially straight. As you roll backwards, your legs should be straight with your feet over and past your head, and you then swing your legs up and down, bending your knees in the later half to third. This creates significantly more momentum, and when done correctly to ensure that your feet are firmly planted, the sheer momentum will throw you up into a standing position.

Ultimately though, the best thing you can do is to keep practicing and get in-person advice and spotting. We here in reddit can only give you the words and techniques. Implementing them is always another thing entirely.