Mech arena if I am the choosen one who will get anything at last spin so answer me am I the choosen one.

If yes so please increase my luck so that I can be strong enough 

I got Onyx in third last spin. What is this

If you don't answer me or increase my luck I am leaving this game forever

Even though I like this game so much but if the game is unfair with me so then the game is not made for me

Bro, complaining in the Forum will never increase your luck. Just grind enough so that you can guarantee the mech/weapon/pilot. Rewards are completely random. Sometimes luck plays an important role too, but relying on luck alone won't get any rewards. 

I can help you with ECRs if you like.