I don't consider these really startups haha. No way. I think you have not succeeded YET because you need to find something fun to work on that you want to build for yourself.
I honestly built the wake-up call service for MYSELF and nobody else. I couldn't wake up for classes in college even with an alarm clock (didn't sleep much since I was hacking all the time). I thought having someone call me made the world of difference in signaling my brain to move. So I built the wakeup thing for myself, then maybe a year or two later I added international support after I realized people were paying like $2 a week with it. People actually paid for it? That blew my mind.
The other services and things I built were again just because I wanted them for myself. Just have fun with it. True, these are easy to build projects, but the real skill comes in when you can pump one out in a day!
* I mean pump one out in the sense that you build it, both front-end and back-end, and then release it on the internet. A lot of these projects I didn't do any fancy deployment stuff with, I popped open `screen -DR`, did a GitHub deploy key to the server, cloned repo, installed deps, and ran `node app`.