Bitcoin halving has occurred two times in the paste and the result was increase in the price of bitcoin. There are only 4 million bitcoin left to be mined, which means bitcoin is limited. More people are demanding for bitcoin and the supply would be cut from 12.6 to 6.25 bitcoin probably on 14th May, 2020 or before 18th May 2020.
Already the remaining bitcoin are not much and halving will reduce the supply, people are still demanding for bitcoin and lastly, because of the coming halving, more people will demand more for bitcoin. All these will make the demand to increase while the supply reduce and result into bull run, which means halving will surely increase bitcoin price.