How do i make it so after a random amount of seconds my model switches animation

How do i make it so my model completely switches animation after a random amount of seconds.

An state machine like this click on those arrows
and do this for each state transition

This thread had the same theme.
https://forums.unrealengine.com/development-discussion/animation/1447379-random-idle-animations

Is there a simpler way this is my first time animating?