How to fight and always win?

How to fight (i.e. engage with external world) and always win?

Become indifferent to either outcome or see good in either outcome.

Same idea in the BG

hato vA prApsyasi svargam  jitvA vA bhokshyase mahIm.

Dying you will attain heaven, or victorious you will enjoy on this earth.

This yoga resulting from vicAra leads to invincibility, fearlessness and absence of sorrow.

Fear and sorrow arise only from unpleasantness to the senses or ego.

Changeability of mind's attitude towards same object from rAga to dvesha should be noted. It passes, because the mind changes. It is never either always positive or always negative towards objects in the world. But it can be made always unmoved by rAga or dvesha.