Welcome to the forum.
You asked whether you should move from being an SEO to a web designer. The answer must depend on what skills you have. I assume you know enough about both subjects to know what skills you would need in order to succeed. It's up to you to decide whether you feel you have those skills.
That said, in general I would think that there would always be a better market for web design than for SEO - if only because it's something that most businesses will understand, and will see the need for. With SEO, you've got to sell them the concept before you can sell them your services, and that's always difficult. But you've also got to take account of the competition in your locale. If there are dozens of design firms but no other SEOers - well, that's a factor to take into account.
One other point. If you want to succeed in any sort of design work, you'll have to do something about your writing. If your post in this forum is typical of what you write, you should consider looking for a course in basic English, especially punctuation and grammar. I hope you won't mind me mentioning this, but the fact is that you won't get anywhere in any kind of business with such sloppy writing.