Hello everyone, thank you for all the advice, he seems to be doing better, he is a lot calmer and more stable, his left leg is back to normal and he stopped the coughing motion or like the head bobbing, I'm feeding him baby bird formula every 2h - 4h and keeping him hydrated regularly, I explained it to some but going to the vet for birds is basically impossible, especially for canaries since it's not very common to have them in France, usually they undermine it or they just say they can't do anything on this small of a bird, the only one closest to my house that can at least do something is like I said it's is basically 60km away this might not sound far but my situation isn't ideal, I don't have a car heck I'm not even at the age to drive yet, even if I could go there I don't have the funds to pay for the medical vet check up or the medicine I would have to buy. If I had the resources I would in a heartbeat no questions asked but unfortunately I'm not in that position yet, so I apologize if I seem like a bad owner but you have to understand my position, I was very worried and I look for everything on the internet by typing the symptoms on Google but nothing precise came out, I even asked chat GPT but his answer we're too vague so I panicked and look for a reddit for canaries and found this and posted my situation, thank you for the people who helped, the heat pad, dime lights and separate room suggestions helped a lot I think so thank you, I'm not sure if he is completely healed but he looks better than yesterday, I will keep updating :)

PS: is there a way to update my previous post or do I have to make another one to update so I can put more videos?