Maybe it’s time to either visit an Apple authorized service center or just replace the key cap and the other two parts under it so you have a new key. As well as a chance to clean a bit more.
Here’s one source for the needed part [https://www.thebookyard.com/apple-keycaps-clip-select.php?cPath=66_510_499_725|MacBook Pro keycap parts] click on the image and drill down as needed. You’ll also want the scissor clip and rubber cushion if needed.