Playing hours of online blitz every day is not serious chess improvement. Playing bughouse is not chess improvement. Watching live games/commentary is not serious chess improvement. While these things may be fun, there is little chess improvement value.

There are a number of chess training mistakes. Here are some more of them:

1. Lack of training the right way
2. Lack of deep and thorough analysis
3. Lack of commitment to consistent improvement
4. Lack of physical, emotional and mental training
5. Playing too many tournaments, especially the wrong types, etc.