Weak Legs

over the past 3yrs i mostly stretched, because i like to kick high sure kicking high and doing splits is awesome, but having weak chicken legs is not lol. Ive quit stretching for last two weeks ive notice a slight difference but two soon to tell any real difference. One thing thats noticeable is my hamstrings and calves feel tighter. I hope to also achieve a higher vertical leap so jump kicks are easier.