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People won't just come across your site. Talk to people who run other web comics and get them to write a small blogpost about you, or have a link to you on their site. Get an advert for your webcomic on similar sites. Go onto forums and make a thread about the site. Put links on your Instagram, Twitter, or Facebook and in your signature on any forums you are a part of. Ask any friends who would appreciate its humour to go on, and perhaps advertise it on their blogs/sites. Getting in with the webcomics community and making friends with other creators can really help you be successful in webcomics. They can give you advice, encouragement, and help you promote your comic. The community is strong and supportive, so don't be afraid to reach out. Spend time interacting with and supporting other comic artists, and be sure to be respectful and positive. Definitely don't be creepy! Running a website can be expensive, especially if you have a lot of readers. It is also really time consuming. If you want to create more time to work on your comic, you'll need to find a way to get it supplementing your income so that you don't have to work as much.  You'll make a little money by putting ads on your site (Google Ads are easiest) but most webcomic cartoonists make most of their money from merchandise (often called "merch"). Be prepared to deal with getting books, posters, stickers, and other items printed and made, as well as traveling to conventions and things like that. If you're not up for these things, then you're unlikely to be able to sustain your comic in the long run. Don't let your web comic die. If you've been unpopular for a few months, don't stop updating! If the material is good, people will come. Making a really successful webcomic is like becoming a movie star. It takes a lot of hard work and most of the time recognition won't come right away. You have to persist!
Advertise your site! Connect with the community. Monetize your comic. Keep updating!