You can try to pursue them for a money judgment, but how will you collect?

If you’re considering switching careers, pursuing a license could be a great opportunity.

If you have no desire to actively pursue other investments where you make more than a 2.8% return, then by all means pay it off faster.TYFYS and best of luck!

Without know more specifics, I'd suggest selling what you have now and investing in properties closer to where you live (and pursue 1031 exchanges).

However, he isn’t much of a dreamer which can often hold me back from pursuing business ventures or ideas.

It's very easy to make one tiny, minor assumption to fill in an unknown that completely changes the context and consequently the answer - I've caught myself doing this a few times.As far as the legal responsibility for the debt goes with Subject To, my guess would be that the contract basically provides a pathway for the seller to pursue the buyer for recourse related to losses they suffer from the default of the original loan, like a form of indemnification, but does not absolve the seller of responsibility for the debt.

Now that I have a stable income and the drive, I want to finally pursue my curiosity for Real Estate. 

I have had PMs successfully get large reimbursement including this PM got one last year (but I do not remember which OTA).It is my belief that AirBnb rejects some smaller claims hoping that it is not worth pursuing.  

Quote from @Martti Eckert: Hi Bigger Pockets community -I am interested in pursuing the BRRRR strategy in one of several Ohio markets this year.

I offered a month’s rent in addition to what was reasonable for loss of use of 7 weeks of garage and 2 weeks of kitchen/bathroom unavailability (adjusted for back rent for unauthorized pet) but no response from tenant other than pursuing legal option unless I share Landlord insurance details.