Get Out of the House
Get out of the house.
Whenever you can, leave your home. Go on a walk. Go to the random event you were invited to. Go work from the coffee shop instead of your couch.
Nothing that will change your life will happen when you're sitting at home. You won't meet your future spouse. You won't chat up the person who you're sitting next to at a coffee shop about what they're working on and then end up collaborating with them in the future. You won't make friends by staying home instead of going to the intramural soccer game you were invited to.
You have to leave your home any chance you can. Life happens when you're making it happen. Leaving the house is the first step. Start there.