What will i build

Hi,

I am planning making mmo game. I also have mmoserver project which i have been writing 2 years but it wasnt going regular because of my job. Currently my server can handle AABB collisions because of optimisation and collision limitations of game engines. Such as unity3d engine. ( it doesnt allow create 65535 collision at the same time in one scene). It has component base architecture design. I decided this after i have researched a lot of game engine structure.
I know this way is not looks meaningfull for one person but i cant stop myself and i alse reached some milestones and i realized it was doing well until this time. I really like think about this topic and doing something. And now, i have a motivation to starting this course and i want to hear your positive opinions. Btw sorry my bad english.