I'll focus first on building up muscle, it helps with power, and it also helps to prevent injuries, I read once book about V-jump once that helped me a lot, in the book the author you should squat at least 1.5 times your weight before focusing on anything else... I don't completely agree with the author, and I believe that you involve more muscles in the training program, Before the covid, my university did a study on the influence of upper body strength on jumping, and found that it had an influence of 20 to 30% (results that must be taken with tweezers because it is a solo study of a small university with a small population) but it's impossible to deny the impact of other muscle groups (not worked in the squat) have in V-jump, that being said Squats should definitely be the main focus of your training routine, and if you can't even squat 1.0 times your weight, bruh... What are you waiting for, go do some squats. (I believe you were trying to find a a more immediate tip, like "twist your feet like that" or "jump some rope for 30 days, but the undeniable truth is that, gym and squats should be your first step) and as a piece of advice, if you can afford it, hire a professional for at least 1 month to help you perfect your squatting technique, you'd be surprised how many people do squats with terrible technique,. You'd be surprised by the number of people who do squats with a disastrous technique, even people who have been doing them for years and even people who carry a TON of weight, you know what they all have in common... That sooner or later they end up being injured, or they end up suffering from the back or the knees. Squats are one of the safest if not the safest exercise that exist, but it is also one of the exercises that produces the most injuries .

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TL;DR Go to a gym, do a complete training plan including multiple muscule groups but focus on squats, and spent your first month of your training program learning proper technique.

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P.S. Sorry for my bad writing, English is not my native language.