I'm scared of upping calories

hi all, i am 157cm and have been on a calorie deficit for quite some time now i've been eating at around 1280kcal a week for the past couple of months. i have also been going to the gym for about 1hr x3 a week as well. though i only do weights (primarily upper body) and im very inactive outside of that. Through this i've lost around 15kg which is great and ive also gained some muscle.

my problem is that recently ive been wanting to up my calorie intake to around 1450 as i'm nearing my goal weight (about 3kg off of it) but i am so fucking scared of gaining back the weight. I've put so much effort into losing it and im very close to looking the way i want. Does anyone have any advice as im scared lmao.