You gained $300k from the investor, but he was the low bidder. 

My capital gain, after recapturing depreciation, is approximately $300K.

Thanks to a special IRS tax loophole, homeowners can exclude $250,000 to $500,000 of capital gains from the sale of a primary residence, so long as they have lived in the property for two out of the prior five years."

But you can start small with one deal and do more as you gain confidence.

(If you can't get in the door on your own merit... maybe you shouldn’t be doing this.)Encouraging students to utilize his private Facebook group members to post fraudulent reviews for other students websites in order to boost their search results and by doing so intentionally misleading sellers as to the students knowledge, skills and ability to closeInstructing investors to deliberately target and befriend nursing and assisted living home staff in order to gain their complicity in preying upon patients and residents. ....

Though impossible to measure, and a fraught investment metric there is a certain emotional capital gained by creating something beautiful that you love and can enjoy.

If you declare a property as 1031 eligible you can defer capital gains on the sale. 

I haven't even gained anything with them yet but, i have a close friend that started with them 2 years ago and, is still with them now getting new rounds of funding and compiling cards into one account.

The lessons and experience you gained will likely be much more valuable than the money.

To grow, keep buying more and use the money and worth you gain to reach your dream of having rental properties.