Haven’t lost any weight in more than a year

Hi guys, i’ve lost 12 kilograms last year and can’t lose any more (first pic is where i had around 75 kg and 2nd 63 kg). Seems like i’ve hit a weight loss plateau or something. I’ve tried gym, walking at least 10 000 steps, but can not lose any more weight. I also have a sweet tooth, which doesn’t help. Could you share some tips on how to lose more weight please? I’m 5’4 and 138 pounds (63 kg). I’m getting desperate, I’ve always hated my body and wanna get to my goal weight (55 kg), which seems unreal.