There are quite a few tools that help you find interesting accounts to follow. I wrote about how the space has evolved, and these tools have build upon each other. Here's an overview of some of them:
https://fedifollows.fedified.com/ by @DataDrivenMD A curated list with the accounts separated by ~20 topics. Allows 1-click follow, and prioritizes accounts by activity. A good option for new users that want to get started.
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https://fediversereport.com/a-next-generation-of-follow-finders/