Now instead of paying that property off at an accelerated rate while leveraging equity for a multiplex, I am unsure of what to do next.

You're accelerating your education by constantly putting yourself in position to talk to people with problems, much faster, and on a much more consistent basis.  

A great way to accelerate your path to wealth. 

From my experience, there is an acceleration clause in your lender's mortgage package stating if they find out you're sub-2ing your house, they will call the loan due.

This is one of the main draws of commercial real estate investing, and some high net worth individuals purposely invest in large deals that accelerate depreciation so that they can shelter all their income.

Networking and helping has accelerated the pace in which my business has been able to grow.

Your VA loan is a great benefit and you can use it to accelerate your portfolio but it does not fail proof. 

If this death does not specifically trigger something (such as acceleration of the debt), then the agreement as written continues to be enforceable by the decedent‘s estate or heirs.

I’m thinking about using the money made to accelerate the payoff.

I found this to be helpful in the beginning, hopefully you will aswell ...acceleration clauseA clause in your mortgage which allows the lender to demand payment of the outstanding loan balance for various reasons.