Hair loss problem. As they were before!

I am a 23 years old male with curly hair. My hairline is starting to recede and my hair in center front are thinning. I always had very thick and dense head of hair. There isn't even remotely any baldness in my family. I used to blow dry my hair when I was in college but have refrained from doing so for quite a time. I never use hair gels or waxes or serums. I just use a shampoo and conditioner in my hair. I started noticing my hair loss recently this year. I drink occasionally and smoke 3-5 cigarettes daily. I've never had any dermatological problems in the past nor do I have any other medical history but I have pit on like 10 kgs in the past year since march 2020. Please guide me as to how I can nurse them back to healthy and dense condition as they were before