I have agoraphobia too. I should actually be at an event right now, but depression demanded I Not Do That... :')
What has helped me is meeting people really, REALLY slowly. Aim for making friends online. If you have a hobby you really like or any interests that you'd love to use to connect with people, find a discord group or something and chat. Join voice chat, if you can. Or, if talking is too hard, listen to them talk. I personally despise voice and video chats way more than text or in person stuff, but it's given me a little more confidence in talking to people.
And inevitably, you're going to have a moment where you feel embarrassed as hell over something you said. If you're talking with people online, its super easy to bounce from that conversation or whatever, so you can recover in private. As you practice going outside, like if you need to go to the store or something, say like 2 words to someone that you wouldn't normally need to say. Like ask someone how they are, or whatever. And if you fuck it up, or you embarrass yourself, or you say something you didn't mean to say, at least you tried.
Socializing is something all people have to practice. Humans aren't born with an innate capacity to communicate, and messing up is a part of learning new things. Some people are naturally better than others, of course, and those people can make it look effortless, but social cues take time to learn. That's why kids and teens can be so awkward! So trust me, anyone can learn it even if its incredibly nerve-wracking or we're at a disadvantage for neurodivergent reasons, or because we've been isolated for a long time, or social anxiety plays a part, etc. It takes finding the right people and the right balance between pushing against the anxiety and giving yourself a break when it gets to be too much.
