I’m not a competitive person, but sometimes it is worth to put some pressure and participate in competitive events just to see what happens.
Kaggle: Your Home for Data Science. A great place to learn ML
CodRep: Machine Learning on Source Code Competition. 5th Place. KTH, Stockholm, Sweden, 2018
COJ: Caribbean Online Judge. Top 10th in my university at that time. UCLV, Villa Clara, Cuba, 2010-2013