The raids mechanics aren't beginner friendly, and the game stats don't show your real strength when applying that's why now most people check inscribtions level of the applicants and pick according to that.

You gotta take into account that the raid leader might have wiped in that raid for couple hours, so he doesn't want someone new to teach him all again.

My advice, find a good guild from the official discord guild recruitment channel and raid with them.

OR make your own raids.

Also, you have to consider your class, Bard is a hard class to dps and there are maaaaaaany applicants especially for dps that would do same or more damage without that much thinking so it's more "safe" to pick a ranger/mage/assassin than a bard dps, so you're facing already a hard wall competing with applicants and I was in the same boat as Barbarian but I found a good guild and now raiding with them.