Looping a motion graphic background

Hi! I'm wondering if anyone can help me to loop this background where it doesn't show it starting & ending. I'm new to after effects & I'm trying to make motion graphic backgrounds for my church. With it showing where it starts and ends, it won't look that great. I've looked up many tutorials but I feel like none of them are really all that helpful. Thank you for all your help in advance! 

Attached is the video of my design.