I am NOT a quitter !!!

So I have reached a plateau and I have lost my motivation.  HELP ME!  I really want this but can’t get back into the swing of things.  I am trying to think of things that will get me back on track and motivate me.  I like change and I love a challenge.   My gym membership is up for renewal in September and I have already considered cancelling my membership in the hope to find a new gym to work out but my fear is that I will never go back.  Any suggestions, tips??? All are welcomed looking forward to hearing from you.