I feel with you.
I have tried to get trough my main storyline but can’t get past the quest “it's properly pirates” since it requires a group. I have tried for several hours and days but I can’t get in.
Actually when asking in chat people say do Fates it’s the fastest way to level.
Sadly I have given up and continued to another game. But I am still hoping they will remove group quest from the main story one day or at least only include them at max level.