If you have time then try working out and doing sports. It sounds asinine, but I've found that exerting yourself increases your levels of energy in the long term. Even something small, a little bit at a time will be greatly beneficial. Also try doing it with someone else and try having an active social life that will motivate you to go out of the house and stop spending all the evening alone on the couch watching YouTube (which is really detrimental, ask me how I know it).

Like the Romans said "mens sana in corpore sano" (you need a healthy body to have a healthy mind)