Is there an easy fix for low water pressure in the house?

Are you on a well or city water?

Maybe contact 311 and tell them you suddenly experienced a drop in pressure? If you're not on well water you should be able to get them to come out and take a look. Do your neighbors have the same issue?

If it's unique just to you and you're not on a well, there could be some type of blockage or leak.

You can take the water savers out of your aerators and shower head.
There’s a gauge you can screw on your outside hose Bibb that’ll tell you the water pressure psi. Once you get that, maybe talk to the city.

Your house most likely has a water shut off valve. Once they're about 20 years old the packing in them over time swells and let's less and less water through your valve. I ended up cutting mine out and putting another one at the street to shut my house off. It increased my water pressure tremendously. My house was 26 years old whenever I cut the valve out. We cut the valve in half and with it all The way I opened up with the packing was blocking most of the free space.

Perhaps your PRV needs to be cleaned and adjusted.

What kind of water pipes do you have? If an older house with galvanized water lines, it is not uncommon for calcium deposits to form inside the pipes that significantly restrict water flow.

When I move into my current house in 92 I could not take a shower and it took about 15 minutes of water running to get enough water to take a bath. The house was over 60 years old at that time.

I removed all galvanized pipe and replaced it with 3/4 and 1/2 inch copper lines and have never had any issue since. It was night and day with water pressure.

quote:

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1989

With crawlspace.

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I'll assume your lines are either PVC or copper being built in 89. By then, galvanized water pipes were a thing of the past with copper and PVC being so much easier to run.