I'll answer this seriously, since every other answer just jokes about having no social life.

I used to introverted as fuck long ago. Now I enjoy a fairly decent, balanced social life. Here's some points that may help.

1) This is the most important point. Schedule your time with discipline. Especially if you freelance on the side like me. If you decided to finish a project, mark your calendar and get to it. No dawdling. If you decided to watch a movie, mark your calendar get to it. Decide that you will spend an X portion of your time with entertainment and Y with work. Don't let them overflow into each other.

2) Don't hate Facebook, instagram, WhatsApp and other tools. Okay facebook is shit. But he rest are just tools. You can use them to connect meaningfully or to follow shitty things and make your feed toxic. If this isn't your cup of tea, at least try using them on the weekends, you'll make new friends.

3) If your work requires you to work long hours and weekends ok often just quit. You decide what your limits are. I quit a similar toxic job and it's made a world of a difference.

4) If you have a significant other, establish communication rules and boundaries with them. It's perfectly fine to tell your spouse or boy/girlfriend that you're busy at the moment. It is equally all right to tell your work that ou aren't available because you're busy with family/friends.

5) Visit a gym and get your stamina up. You'll meet fun people. It takes a healthy body to have a social life or you'll just be permanently tired.