Question About Quest Items I'd Like To Get Rid Of

I had played on the server before, but got out of playing minecraft for a while and now I came back, I wanted to start fresh when I noticed, that the bank persist through each class/character you create, even when the last one gets deleted, so I wanted a fresh new-ish experience and destroyed all of the stuff, except I can't get rid of quest items, any way for me to get rid of them?

 

Put them into your inventory, fill every slot of inventory with something else and dragndrop them out make sure there are no open spots in your inventory or they will teleport back in, if every spot is taken up the quest itmes will be deleted.