How to Land second shooter Wedding gigs?

I’m a Maryland-based photographer looking to expand my wedding experience by second shooting. I’ve shot a few courthouse weddings solo but haven’t had the chance to be part of a traditional full-day wedding yet.

I’ve been reaching out to local wedding photographers online but I realize it might take more than DMs to connect. What’s the best way for someone like me who may not have a lot of experience but is eager to learn - to actually get invited to second-shoot?

I’d love any feedback or tips on how I could approach assisting on a full wedding. Even hearing stories of how others got their first second-shoot gigs would be huge! Thanks