What type of new paragraph transition could I use for explaining a reason why I chose this ( for a second reason).
Well, it's a little hard to give suggestions without seeing the paragraphs you are transitioning between. However, I think i might have some sugestions. They are:
It is for this purpose that...
Therefore...
All this to say...
In addition to...
In lieu of this point...
In light of this...
I'm sure there are more transitional phrases out there that would work, but these are the ones that I can think of off the top of my head. I hope this helps!