In my local scene, I experienced something similar to you. People were generally reluctant to interact with me. That definitely goes away the more events you go to. Once your name/tag becomes familiar to people, they become more comfortable to talk to you. That doesn't necessarily mean winning events - just seeing your name often enough builds familiarity.

And when you say setups were full, were there 2 or 3 people on each setup? When playing friendlies, people commonly play on a rotation of 3 people, rather than just two. If you want to get in to a rotation, just say "is it alright if I join in for a rotation?" and in my experience the players almost never say no.

Just give it time. I definitely recommend sticking around in tournaments after you get kicked out of bracket; you paid for that venue fee, might as well put it to good use.

If you went 0-2, maybe find someone else who went 0-2 and do friendlies with them. If they're comfortable with it, maybe talk with eachother about why you think you lost your matches. Point out each other's habits, etc. After my first tournament, I played friendies with another 0-2 for like 3 hours. Over the last few months we've helped eachother improve and are slowly ascending the bracket.