I AM STUCK OUTSIDE THE BORDER,I CANT MOVE, I CANT BREAK ANYTHING AND EVERYIME I JOIN THE SERVER IT KICKS ME AND IT SAYS *ILLEGAL POSITION*

I was going to explore random coordinates because i am admin but it said i am only allowed up to 3000000 in the coords. I tried 3000000 and it tped me outside the border. I wasnt allowed to move, breaking blocks, when i pressed f5 i was invisible also i couldnt type. I want to go back inside the border, Plz fix this, The server is play.partynetwork.nl and my ign is renren88888