let go vs strive

let go

verb
  • To emotionally disengage or to distract oneself from a situation. 

  • To dismiss from employment. 

  • To release from one's grasp; to go from a state of holding on to a state of no longer holding on. 

  • To ignore (a comment, etc.). 

  • To fail to maintain a standard of appearance, behavior, or performance. 

  • Used other than figuratively or idiomatically: see let, go. 

  • To gain weight 

strive

verb
  • To struggle in opposition; to be in contention or dispute; to contend; to contest. 

  • To try to achieve a result; to make strenuous effort; to try earnestly and persistently. 

  • To vie; to compete as a rival. 

How often have the words let go and strive occurred in a corpus of books? (source: Google Ngram Viewer )