sprinkle baby powder between the cracks.
Here's an article that might help - https://www.popularmechanics.com/home/interior-projects/how-to/g1546/7-ways-to-silence-your-squeaky-floor/
Watch the This Old House video with Tom Silva, using a device for hardwood floors called Squeeks no More, in conjunction with a hand drill. It can be used through carpeting, with a supplemental device that comes with the package. You'll need to be able to determine where the floor joists are. Tom Silva shows a means of locating them.