If you bought it for $450K and believe it is now worth $550K (get a realtor to confirm that), think about capital gains and taxes when you sell.  

Did you work with any real estate professionals (agents, lenders, etc.) that you'd recommend to others?

This was a lot that was under contract for a purchase price of $500 and all in closing costs, hoa dues, back taxes, affidavit of heirship fees, was about ~$7300 to close and I used my business credit to purchase.Reason I purchased it was because all other "buyers" wanted to purchase at a super low price point where I wouldn't make any money.

Concurrently, I intend to construct our dream home on an adjacent 20-acre parcel that I already own outright.I've double-checked the property taxes, and they're not just accurate but slightly on the higher side.

A rental pays no self employment tax. 

You have to learn from people that know.Find a professional, complement their strengths, and profit together.

i really curious how professional contractor able to enhance the landscape so the house can be sold way higher than without landscaping....

You just need to shop around for the professional companies with multiple crews and an office.

Income taxes vary by person and jurisdiction.

Their inability to respect our professional commitments and personal boundaries led to challenges, yet it was a pivotal moment for growth.Despite these challenges, the journey was rich with learning and growth.