Check out courses in NPTEL’s channel on YouTube. Take a good institute’s syllabus structure, preferably a popular IIT’s. Cover courses in NPTEL by having the syllabus sheet as your guide. You can cover four years’ worth material in a matter of few months.
Use MIT’s open channel and Coursera to complement your ongoing learning.
Join groups in Facebook and other platforms to be a part of discussions and debates. Also join communities like hacker rank, codechef, etc to keep the juices flowing.
If this is something which you want very badly, dive in straightaway. Else you will be cooling heels and your boat gets rusted in the harbour. You will perhaps keep longing for it for many more years to come. Ensure you get your heart’s fill before it becomes a burden of guilt in your head.