You need an examination for a better understanding of why you are beard hair. The Internet will only give you generalizations.
If your beard is not growing as it used to I would suggest seeing a hair loss expert to see if anything regarding your health has changed. It is an option to get a beard transplant if you are a candidate.
I am not sure if you are saying that you had a beard and then lost it, or if it has not grown yet which is the common question. Assuming that you have not grown your beard yet, many young men want to accelerate their beard growth and ask about it. It takes age (genetic triggers which occur in family lines) so if you want to find out when your beard will grow out, you need to find out when your father or grandfather started to grow their beard. Hormones should have kicked in nicely by the time a man reaches 18 but he must wait out his genetics as hormone alone are not responsible for the onset of beard grown. Beard transplants can be done when the young man is a bit older (over 25) if the beard has not grown in yet