How can one start writing 'fairy tale period levy fanfiction'?

In this world, Planet Earth had undergone great changes and humanity is faced with extreme danger. Luckily, humans have something called the Heaven Dao software. After downloading the software, Zhou Hao received one million luck points and used it to open a mystery box and obtain the “108 Levels of Dragon Elephant Wisdom Technique”… Also, Zhou Hao realized that with enough luck points, he could even get his crush to sleep with him! In this world full of Insect Race warriors and Demon Race experts, it is ridiculously easy for Zhou Hao to accumulate luck points…

While Natsu And His friends fought side by side against evil, against time, different worlds, different timelines... Eventually in each and every tree root of all alternatives futures when they reached the point of creating the Time Hole to seal Acnologia the burst of energy from going back and forth in time messing with the order of things burst out reducing everything in an empty space leaving an injured Acnologia only to turn into nothingness as well... The Gods Sighed they reverted the world back again and again but this realm was reaching it's limit... thinking a solution they decided to ask for help from the Celestial Realm Dragon a being so powerfull none of the Gods could contain her in their worlds letting her travel in the gaps of realms watching countless worlds and mortals... It was then that the adventure of a certain someone Began!!!!!!!!!!!!!

Lin Qi transmigrates to a world of immortals. In this world, there are sword immortals who can behead a person from a thousand miles away, peerless great demons who burn mountains and boil the seas, and ancient gods and devils who can divine the heavenly secrets. As a disciple in charge of miscellaneous chores in the Skysword Sect, Lin Qi doesn't have any cultivation talent. A hundred years had passed in a flash, and seeing that he has nothing to do with such a great world, Lin Qi is incomparably depressed. Just as he is about to die of old age, he suddenly awakens a cultivation system. Unlocked One-Click Cultivation System: Limitless cultivation speed boost, one major realm per second! Unlocked One-Click Technique Practicing System: Cultivation technique instantly maxed out. Cultivate 10,000 techniques at the same time! Unlocked One-Click Clone System: 100% of the actual body's strength. Can self-destruct, can teleport, can fuse! As a result, Lin Qi begins to cultivate again with his hundred-year-old body, becoming invincible under the heavens.

The mc got choosen by the 'Crossing God' to cross to many worlds along with the 'Invincible System'. Current world, One Piece. Disclaimer. *Writing this just for my own fun, and spend my boring time. *English is not my mother language. I apologized for my bad grammar and bad english. * I do not own One Piece, other Animation, Movies, Novels. Beside this :D

Our MC dies, but instead of going to an after-life he gets a second chance to live his life in the world of One Piece. Follow him as he makes his dreams come true. Which is to conquer the vast seas with the strongest crew by his side. MC will have the appearance of Achilles from the Fate Franchise -An indomitable spirit that will not crumble under pressure. -Unparalleled speed and reflexes. -A master of the spear. -A charismatic man who can inspire others as well as draw in the ladies. MC will not have devil fruit powers.

Ajax, a young man, supposed to be completely normal, changed, by a twist of faith at his first birthday. *I do not own Fairy Tail, neither anything related to it* I do hope you enjoy and have a great day!