getting kicked from end game pfs as soon as I join?

[Zetsumei_Tsunarashi]

In my experience, usually if you get immediately kicked from the party it's probably because the party leader was too lazy to set the PF how they really wanted it and you filled a spot that they actually wanted another job for.

For example many PFs say "no dupes" in the comments but then dont bother to adjust the role filters to avoid duplicate jobs. Another example is when they wanted a standard comp of 2 melee 1 ranged physical and 1 ranged magical but dont filter each dps slot accordingly.

Basically it's probably nothing you did wrong just the party leader being lazy and then kicking people when they dont get what they wanted.

As for people not joining a party that you set up, again how you set up the PF matters. One of the most common reasons I see PFs stagnate is because someone joined and then left the group and the spot they left now only accepts the job they were on when they left and the party leader fails to correct this. I personally see this as a sign that the party leader is either AFK, or too incompetent to even know how PF works, and opt to avoid anything to do with that party.