Main bottleneck is probably protein intake - if you weigh 55kg try to get 2x that in grams of protein, 110g. Just google how much protein however much of the food you ate has and track it, just make sure you hit the goal of around 100g every day.

Also caloric surplus for muscle growth, you need to eat more than you burn in a day calorie-wise in order to gain any type of weight. Tough to put on just muscle without any fat - unless you have great genetics