There are too many ways to improve website. You have to take advice from expert.

Follow SEO strategy off page, on pag
Off page SEO-
Directories Submission, Article Submission, Press Release, free Classified Ads, Forum Posting, WEB 2.0, Video Submission, Bookmarking Submission.

On page seo- Meta Description tag, ALT tags, H1 tags, URL structure.
And also Google +, Facebook,Twitter, Linkedin quality Social networking sites promote website get effective traffic

Web development is a broad term for the work involved in developing a website for the Internet (World Wide Web) or an intranet (a private network). Web development can range from developing the simplest static single page of plain text to the most complex web-based internet applications, electronic businesses, and social network services.

Keep asking clear question....

To improve your website looks and feel to get more improved spending time you try redesigning of website ! as digital trend begins It's necessary to have a website which looks more attractive on mobile....

"As per researches 80% people are browsing through MOBILE Devices and 20% are Desktop related Devices around the world."

You can hire professional web-developers and get promoted with networking company Network Marketing Training - create cool stories, useful articles and share experiences locally! And just think about meetups you would hold! Think of it! :)

To improve website you need
High-Quality Content
Up-to-Date In-Store Information
User-Generated Content
Exclusive Video Content
E-commerce Integration

I see its quite difficult

quality content and smart seo will help.