What other things should I avoid/do when treating Tinea Cruris along with medicine?

Olive oil. It’s natural

What should I avoid while using ketoconazole topical?
Do not get ketoconazole topical in your eyes. If contact does occur, rinse with water.

Avoid covering treated skin areas with tight-fitting, synthetic clothing (such as nylon or polyester) that doesn't allow air to circulate to your skin. If you are treating your feet, wear clean cotton socks and sandals or shoes that allow for air circulation. Keep your feet as dry as possible.

You may need to avoid sunlight if you are treating pityriasis. Follow your doctor's instructions.

Avoid using skin products that can cause irritation, such as harsh soaps, shampoos, hair coloring or permanent chemicals, hair removers or waxes, or skin products with alcohol, spices, astringents, or lime.

Avoid using other medications on the areas you treat with ketoconazole topical unless your doctor tells you to.

Source: https://www.drugs.com/mtm/ketoconazole-topical.html

What should I avoid while taking levocetirizine?
Avoid driving or hazardous activity until you know how levocetirizine will affect you. Your reactions could be impaired.

Drinking alcohol with levocetirizine can cause side effects such as drowsiness.

Source: https://www.drugs.com/levocetirizine.html

What should I avoid while taking itraconazole?
Avoid driving or hazardous activity until you know how itraconazole will affect you. Your reactions could be impaired.

Avoid taking antacids within 1 hour before or 2 hours after you take itraconazole. Some antacids can make it harder for your body to absorb itraconazole.

Source: https://www.drugs.com/mtm/itraconazole.html