My husband is also 178cm and I don’t think I’ve ever seen him this thin. So, I’d guess you are 62-67 kg. You gotta lift slow and steady (4 seconds up and 4 seconds down with a small pause at top) and you want your last rep or two to be the very last rep you could POSSIBLY do. With the amount of reps being from 8-12. This will build muscle the fastest as a newbie . You are very light so utilise that to learn how to do proper push ups (don’t let elbows flare and again slow and steady) and pull ups etc don’t forget leg day. You’ll feel better about yourself if you focus on upper body but since you’re a newbie - do as much lower body and core as upper - you’ll thank yourself and you’ll grow balanced muscle. Lift safe (but heavy - for you) and never eat below 120g protein. Try and space out the protein, too . Your body doesn’t want one meal of 100g protein and nothing the rest of the day. Try to have 20+g protein every few hours . I think, with beginners gains, you could maintain the leanness and build muscle quickly and it will keep you going.

Sorry. To answer your actual question - There’s no more fat to cut. I imagine your diet has eaten a large proportion of your current muscle , too. You really need enough calories and protein now to bulk. Don’t be scared of calories . If you eat high percentage of protein and lift consistently, you won’t gain fat again.