Less water getting pumped in 2 hrs - Please advise on the right pump selection and positioning


My name is praveen, Recently we drilled a borewell at our land near Chitradurga, we found water at 380 feet during drilling, we continued to drill till 440 feet.

We have placed a pump of 6HP at 300 feet, But later we notice that water is getting pumped only for ~2 hr after 2 hr we see less water is pumped.

I am not understanding what is going wrong, Do I need to upgrade my Pump or Do I need to place Pump still downward.

Your answers will help me with the solution to my problem.

Your quick response will be greatly appreciated.