All your projects can be found under the Projects shortcut available on your Smartcat account homepage.
here’s a great feature to search through your project list. Especially, when you have many projects. But sometimes it can be a bit tricky to see that the filter is on.
You can sort and filter the projects list by a variety of parameters as described in this article.
If you can't see your project among the active ones, there's a possibility it's archived. The archiving rules are described in this article.
There's also a slight chance that your server isn't working at the moment. To exclude such an option check out this link.