Google Sheets - How to reduce number of X axis labels?

I have a chart with dates along the X axis, but the chart displays them quite close together, producing a rather ugly graph. How might I reduce the number of visible labels to increase the readability a little?

Edit: Sheet in question https://docs.google.com/spreadsheets/d/1P4sTn6YOp_747Gc5nCF34af1MN3AjhO0wRj85FjAqkA/edit?usp=sharing