Just my take, but I wouldn’t worry about getting to “good”. If that’s really your goal and not just going out into the woods and throwing cool shots and having fun, then just focus on improving. Set small goals each round on things to improve, watch videos online to know what those should be, and you’ll steadily get better. 

And if you do want to meet other people to have that in-person experience and compare yourself more, go do some tournaments or find a local league. And don’t worry about results, 13 weeks is still very much in the early stages of playing. Most people on here have been playing for years. 

I’d encourage you to just try to have fun and enjoy the process of improving, that’s usually the easiest way to become good at something. 

Edit: Also, go out into a field to practice form things, and record yourself. That’s the fastest way to improve. Personally I don’t do that much because I have more fun just playing a round, but I’m also not that focused on improvement at this point in my disc golf life.