Remove links from low-authority websites. Backlinks leading to your site can have a negative impact if they are coming from a spammy, low-quality site. So use Alexa’s Site Linking In Tool to review a list of the sites linking to your site. Attempt to remove links from low-quality sites by reaching out to ask them to take down the link or by using the Google Disavow Tool. (Google doesn’t like you to overuse this tool, so only use it when necessary.)
As far as actually doing the nuts and bolts building and design of your site, you also have plenty of options. You can hire someone to design and code a website, or you can try your own hand (if you're a novice, The Best Courses for Learning How to Build Websites is an excellent starting point). You can use an online service to create web pages, or build it offline using a desktop software tool. Or, if you're a coding dynamo, use a plain text editor to create a site from scratch. How you mix and match these decisions depends on your skills, time, budget, and gumption.