How many can I sell in a year?

[Cathy Malmrose]

If I want to sell off all my properties in 2021 if possible. I can show that I didn't pull much of a profit on any of them, capital gains should be minimal. (I invested very heavily in their renovation, rookie mistake.) What is going to bite me on the backside and how do I minimize impact? 

Trying to retire & don't need the income stream. Thanks.