If you want to get bigger, you must also get stronger. Strength and size are not mutually exclusive. You must also eat enough to gain weight.
Going from an underweight 49kg to normal weight for your height in 3 years is rather slow progress. I started lighter at 1.76m in my teens and gained that amount in around 6 months IIRC. Maybe less.
Choose a 6 day split from here:
Put in the effort and you will see results. Intensity and progression will make you grow, not the program.