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This could be a nitrogen issue, if the soil you used contained a fertilizer or if you have over fertilized. Too much nitrogen will inhibit flowering. You can add phosphorous by using Bone Meal.

Review the articles below for care requirements: https://www.gardeningknowhow.com/ornamental/flowers/cranesbill-geranium/growing-hardy-geraniums.htm

https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/bone-meal-fertilizer.htm

There can be a few reasons and this article will help you.

https://www.gardeningknowhow.com/ornamental/flowers/geranium/geranium-yellow-leaves.htm

It seems that geraniums have the unusual property of changing their flower color based on the temperature. I'm not sure if providing shade would allow them to change back, but it's worth a try. Here is more information:
http://pss.uvm.edu/ppp/pubs/oh24colr.htm

Yes, dilute shampoo or dish soap can be used to wash pests off leaves and prevent feeding. Here's how to dilute dish soap; the same proportions should work for baby shampoo:

https://www.gardeningknowhow.com/plant-problems/pests/pesticides/homemade-soap-spray.htm

Here are some of the pests that cause leaf holes:

https://www.gardeningknowhow.com/plant-problems/pests/insects/holes-in-plant-leaves.htm

Many of the pests have linked articles where you can learn about how to control them. The best way to identify the problem is if you can catch one of the critters in the act of eating your geranium's leaves. Keep checking it at different times of day. Then you can try to find a photo of the same bug online.

Unlike most traditional zonal geraniums, Brocade series geraniums are valued not for their blooms but for their big, showy leaves. For a splash of color in a flower bed or patio container, plant Brocade geraniums where the interesting foliage complements a mix of colorful annuals.
Fertilize in-ground geraniums regularly using a general-purpose dry fertilizer. For potted geraniums, use a general-purpose liquid fertilizer.
Although Brocade geranium tolerates two to four hours of shade per day, full sunlight is preferable. Shade results in a taller plant that produces fewer blooms.

Red geranium leaves signal the plant is stressed in some way. This may be because the plant is receiving too much water or too much sunshine, or has been planted outdoors too early or in mineral-deficient soil.
Fast-growing geraniums have small root systems that are vulnerable to deficiencies of phosphorus and trace minerals. Treat slow-growing, red-leaved plants with a high-phosphorus liquid fertilizer every two weeks during the growing season. For example, mix 1 tablespoon of water-soluble, 5-15-15 fertilizer with 1 gallon water to offset deficiencies and encourage blooms.

https://www.gardeningknowhow.com/ornamental/flowers/geranium/geranium-yellow-leaves.htm