Thank you for the clarification. Because you said “it took a small team … and then I resigned”, it was unclear that you were part of that small team and instead made it sound like you left because the problem was fixed.
If I know anything about work, I doubt this is all they did for two years. Business doesn't care you have an important project. They will bug you to do other things.
There are few efforts as truly thankless in many organizations as fixing things.