How do I start speaking more clearly?

Youryeodongsaeng
Is this because I have been quiet and has been to myself for a long time that my speech isn't clear? I do read lots of books and yet, I cannot say anything without sluring the words and pronouncing them wrong, or end up sluring the word while pronouncing it. I find this really infuriating for me. How to fix it?
How do I start speaking more clearly?
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