The best replacement for hold on is hold off.

The best alternatives to hold on are rated as following:
★★★★★  hold off
★★★★  let go
★★★★  hang on
★★★  hold up
★★★  move on
★★  oh lord
★★  wait
★★  hold all
★  all i do is win
★  to let go
  hot stuff

Your alternative for hold on is not listed? Suggest!
Speaking about hold on, one probably shouldn't forget about plotyy.

Other search terms related to hold on and their ratings are:
★★★★★ plotyy
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hold on
hold off
let go