First off, you need to stop washing your hair everyday. I wash mine anywhere from every other day to every 3 days depending my activity that week. Many people think that it is gross to not wash your hair everyday but it is actually really good for your hair to give it a break. Every time you wash your hair you are stripping the natural oils that you hair builds on its own, making it dry and brittle if you wash too much. I'm not saying to go a whole week without washing, just give it a few days break. Every time you wash your red hair you are also giving the colour a chance to wash out, this is mainly what causes fading.
Second, you need to evaluate the products you use. The shampoo you use should be a delicate one that does not contain sulfate in it. I highly recommend this shampoo by L'oreal:
This shampoo is amazing, I noticed a huge difference once I started using it. This product ranges from $17-$25 for a small bottle depending on where you purchase it. Next you need to use a conditioner that has colour in it. I had trouble finding this at first but I finally found a great product at Shoppers Drug Mart by IceCream:
I use this cherry red colour mask as my regular conditioner, $19 at shoppers drugmart. It is a little high maintenance to use but I swear by it, it really keeps your hair from fading. The delicate shampoo alone does not do the trick. Use this on damp, shampooed hair. Use gloves when applying and allow to sit on hair for 5-10 minutes before washing out. Not only does it help with the colour it makes your hair soft and shiny.
Thirdly, just a few tips that will keep hair from fading/ keeping it healthy. Always make sure your hair is completely dry before you step outside, any type of sunshine will cause the colour to fade drastically(even in the winter). It will also dry out your hair. When you wash your hair do not use really hot water, you don't have to go as drastic as using really cold water but using super hot water will wash the colour out. Use warm water. Use hair products wisely, using a lot of mosse/hairspray will cause your hair to become dirty and need to be washed more often. One product I use every time after I wash my hair is Argan oil, this stuff is great because you only need a little bit and it adds moisture to your hair which also makes it easier to brush through. It doesn't make your hair greasy if you only use a little and also because when you dye your hair it does damage it and dry it out which makes it really hard to brush/comb when its wet.
This product comes in oil/spray/cream form. I have used the oil and spray, I prefer the oil because it lasts so longer and I feel you get your monies worth. I found this product for $20, was very happy with that price:) Another thing that can reduce fading is the use of heat styling utensils like flat irons and curling irons. I found the least damaging to the colour is a hair dryer, I use it almost every day to freshen up my hair when I'm not washing it that day.
I hope this has helped you with concerns you've had about keep red hair. Any questions at all, just ask I will be happy to answer:) Hope you enjoy!