I have been having big issues with my water pressure since I bought my house. I have replaced the pump and the tank, added a filter too. My tank reads around 25 psi which is the pre-pressurized level set by the manufacturer. I haven't heard it click in a while and when I run my washer or shower (or anything else) the pressure is horrible. How do I fix this issue without spending a fortune? Please help! Thanks in advance.

How deep is well?
What type of pump, submersible or above ground?
What is size (hp) of pump
What is pressure switch set to?
What is pressure reading on pressure gauge?

tank reads around 25 psi which is the pre-pressurized level set by the manufacturer.
That would be the air pressure the tank is set to.
Unless this is a pump and tank set combined you need to set the cut on/off pressure of the pump switch.
Normally well switches are set to come on at 30 and go off at 50 or 40/60 lbs. Tank pressure is set to 2 lbs. below cut on pressure.