Check out how to create a full song from an 8 bar loop idea. Great video tutorial by Production Music Live.
How To Arrange An 8 Bar Loop Into A Full Song In Ableton - Arrangement, Structure, Transitions by Production Music Live
Here other videos about creating the full song from a simple loop
Ableton Tutorial: Turn your 4 bar loop into a Finished Song pt 1 by Beat Academy
Producer Tips: From Simple Loop to Full Song - Part 01 by Off Centre DJ School
From 16 Bars to a Full Track - Arranging Tutorial from Local Dialect by Pyramind
How to Arrange Music (In Under 5 Minutes) by EDM tips