IDEA OVERLOAD!!!!!!!!!!!!

HELP!!!!! PLEASE! PLEASE!! HELP!!!
Okay, okay. I'm overexaggerating (that's a word right?). But, seriously, I'm having an idea overload here! You know, when you have a lot of ideas that sound really good that you want to try out, but don't have the time to do them?! Hang on a minute. (Taking a break...)
Okay, I'm calm(er) now. Long story short, I've been watching Dr. Wolf videos on YouTube lately (you know who he is right?) and some of his videos gave me story ideas, which is awesome! Problem is I rarely have the time to work on my one existing story and I have another idea that I've already started (meaning I have a title, a 200-word prologue written and nothing else).
I now have a total of four ideas, including the ideas I got from watching the videos. I don't usually have time to work on even one story, let alone four. Now I can't decide which ones I want to work on now and which can wait. I'm all but certain I'm going to keep working on my first story, but I don't know if i should keep working on it alone or work on another at the same time. And, if I work on another at the same time, I can't even decide on a single idea. I have too many of them. These ideas are:
~ The Manehattan Crusaders [link: https://www.fimfiction.net/story/213164/the-manehattan-crusaders ]
~ What if Spike never followed the dragons in the dragon migration during the episode Dragon Quest. [Note: this one has been 'started', is currently unpublished and named "Our Dragon's Tale"]
~ What if Rainbow Dash hadn't been able to perform a sonic rainboom during the race in which she earned her cutie mark?
~ What if Princess Celestia was secretly Twilight Sparkle's mother? [Note: this would be an alternate dimension story. The video that inspired this idea was about a comic strip ( http://beavernator.deviantart.com/art/After-All-This-Time-431976400 ) suggesting this topic]
I need help deciding on one or more ideas. Which do you think sound good?