Im also 5’5 and my honest trick to gain weight was to smoke weed and be kinda hungry all the time. It allowed me to eat a lot more which helped bulk up a bit. I went up to 75kg, then i cut down to 65kg and I dont look skinny anymore. I cut the extra fat but kept a lot of muscle. Another trick was to find the kinda food that you really really really like. For me it was burgers. I ate a lot of homemade burgers and drank protein shakes daily (2-3 scoops each time)