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The whole photo didn't come through, but it's possible your trees have contracted a fungal disease, which can happen if there's high humidity or if there isn't enough air circulating through the trees. It could also be subject to root rot if there's been too much water. I would try trimming out the dead parts and removing any debris around them before you give up on them.

Try doing a scratch test to determine whether they're alive:
https://www.gardeningknowhow.com/ornamental/trees/tgen/tree-scratch-test.htm
If it can be saved, a local gardening center can advise you on different treatments.

Likely, overwatering. Plants should never be watered on a schedule, unless you know exactly how much water that your plants consume. Rather, you will want to water once the soil has dried down to about 2 inches. The tree can stand to go longer without watering, but they are sensitive to disease. Watering too much will allow disease to take over.

I would treat with a fungicide. This article will help:

https://www.gardeningknowhow.com/garden-how-to/info/using-fungicides-in-garden.htm

It looks like you could go up a size on the pot. Have you refreshed the soil at all? Replacing the soil and upgrading the pot should help. Has it been fertilized? Each spring you can fertilize it with a 20-20-20 slow release fertilizer. Here is more:

https://www.gardeningknowhow.com/ornamental/trees/cypress/lemon-cypress-care.htm

It may be getting too much water. Here are some care tips that should help: Lemon cypress needs a cool environment and lots of sun. Put it in the coolest room in your house with as much light as possible. Turn it weekly so all sides of the plant get sun. Make sure it is not sitting near a heater vent. Water when the soil starts to dry. Here is more:

https://www.gardeningknowhow.com/ornamental/trees/cypress/lemon-cypress-care.htm

It could be overwatering. They do need regular moisture though. Is the soil well draining? If not, the soil may be holding water.

Here are more care tips to compare with yours:

https://www.gardeningknowhow.com/ornamental/trees/cypress/lemon-cypress-care.htm

These articles should help:

https://www.gardeningknowhow.com/ornamental/trees/tgen/brown-conifer-needles.htm

https://www.gardeningknowhow.com/ornamental/trees/cypress/winterize-lemon-cypress.htm
https://www.gardeningknowhow.com/ornamental/trees/cypress/lemon-cypress-care.htm
https://www.gardeningknowhow.com/ornamental/trees/cypress/cutting-back-cypress-trees.htm