Where have I heard "I never meant to reach 12 watches" before?
...Oh yeah! I used to say it to my reflection in the mirror.
My advice at this point in your collection is: Run.
You are asking the question that every collector has asked at some point, if you manage to reduce the collection to a number that is "reasonable" you will be out of danger, otherwise the sky, or your bank account, is the limit.
If you decide to sell, think carefully about which pieces will go, because later you may feel regret.
About the watches you have now:
I would sell the new Seiko 5, because with the SSK001 it's redundant, and I would change the Pagani for something more original, for example a Seiko SPIRIT. Apart from that, I like all your watches, especially the Citizen Quartz and the day date.