I worked on a website builder of my own a while back. I had a similar issue of finding customers and eventually shut the thing down. The problem is that there’s just too much good competition, so you really have to distinguish yourself in a big way. There’s also a network effect I didn’t anticipate - people want to use the popular service, or the one their friend recommended. Your product is unfortunately not the type of thing that’s compared side by side to alternatives - if it was, your features would matter more. But they don’t, because that’s not how people decide to use these types of services. If I were you I’d find a small target market and go crazy with that group. Maybe make it a website builder for only doctors or something. Get your target group to love it and recommend it amongst themselves, and then you can grow from there. Just being another website builder in a sea of website builders, though - that’s tough. I’ve tried that and I wouldn’t recommend it. It can work if you’ve got a massive marketing budget, or are head and shoulders above the competition, or have VC dollars, but it doesn’t seem like you have those on your side.

Good luck with whatever you do! My email’s in my profile if you have any ideas or questions.