Mind block (Not a chapter)

I am currently stuck and having a writer block, thus preventing me from posting chapters. I got quite a few ideas, but I have no ideas which one to pick. So, I am asking you guys some questions.

So question one is

Do you guys want the mc to stay in Supergirl earth longer (making this a Supergirl arc) or him going back to Flash earth?

I feel that I am spending too much time in the Supergirl world. What do you think?

Question 2 is

Do you guys feel that the story is progressing too slow or fast?

Question 3 is

I am thinking of making a nemesis or villain for the mc. Any suggestions for his or her powers?

Please do comment so I can progress, meaning posting more chapters.

My schedule of posting the chapters depends on your responses.