How much, and how long would take to fix crowding on my teeth. Lost Retainer and doesnt fit. Don't want braces again. (photo)

I got my braces off about a year ago and wore my retainer for about 2 months. Then I lost my retainer and havent worn it for about 9 mothns and doesnt even fit my bottom teeth anymore last time I had it. Now my teeth are crowding on the bottom but a bit on top. What is my best bet to fix this problem and how long and how much would it cost. Would the process last as long as I had braces for (3 years)??

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