Hi. The best way is to carefully read each post before clicking upvote. To see if there is anything suspicious about the content. Such as plagiarism, AI-generated content, and identity theft.
Also carefully check up your community's "newly posted" feed. These accounts all showed up in bulk in your feed and were easy to spot there as they all look similar, with random names, similar photos, similar editing, similar writing, random locations, etc. Also, there are clear indications in their wallet, with transfers giving away fraudulent activity.