Is it possible to create and launch a successful SAAS as a solo developer

So, I created a web and Android application for a small pharmaceutical company seven years ago. The company has grown, and more users are using this application. I´ve been thinking of creating a SAAS based on it, so hopefully, other companies can use it. However, I want to do it from scratch since the original code has a lot of areas of improvement. Back in the day, I created the application with the help of a friend, but now I want to go solo. Do you guys think this is possible? Any insights would be appreciated.