With the Brexit in full force this Friday, many US indexes fell anywhere from 3-5%. Is Monday a good entry point for a buyer's mind or will the bull continue for the next few weeks?
Sorry, but the answer is that nobody knows for sure.
Read all the conflicting opinions about what might happen in the future, make your best guess, make an estimate of how confident you are in the correctness of that guess, and decide how much you are ready to bet on that belief.
If you aren't convinced, the right thing to do may be nothing.