New here, read alot and learned alot already. Thanks!

What I haven't been able to get straight is do I need a storage tank or a larger pressure tank or both?

Current condition: 50' well 600' from house with 200' rise, produces 5gpm. 3/4hp pump and a wellxtrol pressure tank.. maybe 20 gallons?

Desired condition: Be able to have two people showering at one time (at least) and be able to handle a toilet flush

Is this possible?