Why did I lose? It is so hard!

lishogi.org/HRGGZ50NBqcM
I have a horde of army supporting each other breaking into and rush my king into his terrritory, and I solid foundation of material in the rook side, with a material advantage on the board, and why I still lost???

1

Your king is pretty poorly defended and your rook is pretty idle. Also you don't really have a material advantage. At the end of the game you have a lance, knight and gold for my bishop and silver that's at best around equal material.

3