What should i write???

I did create this account with the intention of writing, but months later I've written nothing. The problem is, i can't decide WHAT to write. There are so many possibilities with MLP and i don't know which path to follow. In short, i'm confused about what sort of story to write, Adventure? Dark? Comedy?(probably not), Alternate Universe? Shipfic? I don't know!!! I have a few story concepts but nothing too solid, and i'd really appreciate it if you could give me a few ideas or tell me whether you'd read any of my concept stories should i write them.

Onto the concepts

1 - A world-hopping story where the mane 6 and probably the Princesses and possibly Chrysalis end up transported (i don't know how yet) into a world-between-worlds (sort of like a hub world) with portals to alternate universes. The portals are (with the exception of those in the hub world) disguised as random objects (and at one point a person) so they have to survive/learn to live in these alternate worlds long enough to find the portal out. They would portal from world to world trying to find a way back and on the way would run into some interesting characters. Some of the worlds would be references to films/tv/games, some would be completely original. The story would be better than i can explain it here.

2 - An adventure fic with some shipping (definitely FlutterDash, and some others - don't worry the rest are mostly hetero ships), with a fair bit of violence and battles and a few dark or gory scenes (nowhere as bad as cupcakes, don't worry) Following a quest-gone-wrong type of storyline.

3 - A story that stemmed from me sitting down and thinking one day that Celestia seems too good to be true and Equestria never really seems to have anything wrong with it... it ALL seems a little too good to be true, doesn't it? I came up with an alternate storyline stemming from the start of the first season, with Nightmare Moon as the good guy, the whole brainwashing thing falling apart bit by bit as the mane 6 realise how they've been controlled by Celestia. Will contain a lot of back story about the alicorns in this particular story, how everything came to be like it is, under Celestia's control.

Those are just a few of the random ideas i had, i'm not convinced i should go ahead and write any one of them yet, and if you have ideas for stories for me to write, please, please tell me. I need help otherwise i'll end up never writing anything. HELP ME DECIDE WHAT TO DO.