I never get why anyone cares what is the price per share. How can that matter except as a psychological hurdle or other muddled thinking.
When a stock splits, the price is automatically set to the fraction of split and the number of shares goes up by the same multiplier – so that at that instant the stock is exactly the same value.
Let’s say it will be a 4:1 split and the stock is now at 500$ and you have 100 shares.
The moment after the split the share price will be 125$ and you will have 400 shares.
What the market does after that is the result of the usual mix of solid market analysis plus psychotic voodoo.