Young-ish introvert guy here. It's definitely getting harder and harder over time. IMO the big problem is that nowadays, people don't need to learn to communicate. And so many people never learn. There's too many interesting things to do while you lock yourself away in your house. In the past, even introverts had to learn to communicate. What else were they going to do? Sit and stare at the wall?
What's the solution? Well, you have to be more deliberate with your time and effort. You need to learn to communicate, so learn to communicate. My rule of thumb is that, on average, you need to spend at least half of your waking day outside. Whether for work, or hobby, or shopping, etc. - being outside for any reason is infinitely more useful for socializing than staying indoors.
Also, don't stagnate. It's very easy to get comfortable with what you've been doing and to keep doing what you've been doing. Again, be deliberate about how you choose to spend your time. Pick up new skills. Learn new hobbies. Try out new restaurants. Explore a bit. The more you learn, the better you get at learning. Become well-rounded, knowledgeable, cultured.
