How can I close a trade based on a technical indicator? For example, if the position is long and the RSI is greater than 85, close the trade.

exitLong / exitShort: https://zorro-project.com/manual/en/selllong.htm
example: https://zorro-project.com/manual/en/tutorial_trade.htm

Have you completed all of the workshops in the handy manual? Highly recommended. It starts here:
https://zorro-project.com/manual/en/tutorial_var.htm

Thank you, I'm still going through the manual and the help file. The learning curve is quite high for me and I will often just write my questions here for future users who may be searching for the same thing. I appreciate the time spent answering!