Regarding the message, I would use whichever generic one that the direct mail fulfillment company uses.

Hi, my name is Christian, I am from Peru but currently living in the USA, in the Metroplex Area.So far I have bought along with my partner, 4 properties, I am just starting and traying to learn as much as possible.Hope you all fulfill your dreams in this land full of opportunities, all the best

But you have to work as an agent first and then get your broker license after you fulfill an experience requirement. 

We prefer to keep everyone on the lease until the lease is fulfilled.

You've fulfilled your 12 month promise, you're good to go!

Is there not another house that could fulfill your goals? 

Write your offer contingent on the early fulfillment of your bond.

To maximize investment success those needs mentioned need to be fulfilled outside the investing arena.

And after sitting at a desk the last 2 years straight, doing graphic design, I know that I am much more fulfilled when I am working with people.

Check your local L/T laws, but it sounds like you have fulfilled your obligation.