Main/Alt grinding gone terribly wrong

So I made a paladin as my main character and get it to level 50. After a while, I found out that I did not like it that much so I made a gunlancer through powerpass. I ended up liking it and end up grinding it thinking that I can make it my main character. I spent money on the level 50 starter pack and did all the islands on my gunlancer. And now that it reached level 560, its telling me that I cannot progress through rohendel unless I finished the story on my main character. Now as you all know, it is very hard to progress through the game without the islands especially in tier 1 and tier 2. And to progress through the story on my main requires me to get to level 600 which is stressing me out how I am gonna do it without the mats from the islands. I’m just wondering if its possible for any admin or devs to transfer the main story to my paladin and make it my main. Ive already invested so much time on my gunlancer and its just sad that I couldnt progress through the whole content. I am really hoping someone could help me with this. I am not even asking for refund or anything. I’m just really begging if its possible to delete the paladin(main character) and transfer the story line to my gunlancer so that I could progress. Please help me T_T . I dont want to start again from the beginning and re-do all the islands.

Try to change the main on the charachter screen (I don’t know if this can solve your issue)