Hi,
Have you made sure the main ground to the engine block is in good condition?
If so, I need you to check for power to the purple wire going to the starter solenoid. It will only have 12v when the key is in the start position. You will need a helper to check that. Also, reconfirm that the wires on the new starter are tight.
I attached a pic of the wiring below. Just for the heck of it, see if it starts in neutral. Also, take a look through this link. It explains how to test the starter.
https://www.2carpros.com/articles/starter-not-working-repair
The idea that you get one click usually indicates either a weak battery or a poor connection. Since you have already replaced both the starter and battery, I have a feeling it is a connection unless there is a chance the engine is locked up.
Let me know what you find.
Take care,
Joe
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Sunday, August 2nd, 2020 AT 10:03 PM