Fixing DistinctId Tracking Issues for Unregistered Users in MixPanel

Hello, dear colleagues! I have a problem with DistinctId tracking for users who have not signed up on the site. Every day MixPanel assigns a new different DistinctId for the same users from the same device. This negatively affects the counting of unique users in reports. Is there any way to fix this? Once again, please note, the problem affects users who have not registered on the site. I really appreciate your help!