Hey Yemen, today SEO is a very broad field and offers many job opportunities to make a career. SEO career domain is very interesting and at the same time it is quite lucrative too. Thus, it not only attract college freshers but also people from unrelated and related fields such as Web Designers, Software Developers, Content Writers, SEO Copywriters, Social Media Marketers, Hardware Engineers etc.
An experienced SEO expert is always in demand. He may either be working on his own or is employed by a digital marketing agency or one of the good search engine optimization companies. The different aspects of SEO could be Social Media Marketing, Social Media Optimization, Keyword Research, Keyword Optimization, Content Marketing, Web Designing, Graphic Designing, Link Building, PPC Campaign etc.
So finally, I would say SEO is a really good career option and it has good career growth.