Like many famous lifters say eat till you puke. Jk you probably have to increase your cal. intake, reps and sets in your workout routine, finally sleep a good amount like 7-8 hours.
You want to change your running routine all the time, because you have slow and fast muscles fibres of I'm correct that have different functions. You can focus on slow twitch muscle fibres by running for extended periods of time pase yourself and increase speed as you run or when you are going to again. Fast twitch muscle fibres can be developed by doing sprints or any fast/explosive leg exercises.
Eat one big meal a day, let's say you eat only 2000 cal you should increase it to 2500 to 2800 cal so you have more store energy to move throughout the day without having to eat again. Drink a lot of water to.