What I do is to run the exiftool to strip all the metadata from the image. Next, I check if there are any identifying details in the image like landmarks or background details (e.g. stuff on my whiteboard). And finally I check for the unwanted reflections or for the setup that could be recognised outside the community I share the photo with. Last but not least, I never share a photo in more than one place.
if you upload the same pic here and to linkedin people can connect your lemmy account to your linkedin account, for instance. tineye.com is as example of a tool that does this well
I always assumed that anything uploaded to Facebook would be found by Meta if it’s uploaded elsewhere and then they’ll have all of the data points from your identity on that platform as well.