Similars rejections can refer to both how many similars you submit for the same subject as well as how many similar images are already in the database from other Contributors. It's not a perfect process, and if you read some of the many other posts in the forum on this topic, you'll learn that many other Contributors have complained about the flaws in the Moderation process. Unfortunately, there's nothing we as Contributors can do about it. It's the "new normal" here in Adobe Stock. You might have better luck if you only submit one image from a site at a time, and wait a few days to submit the next one.
Adobe definitely prefers a "slow but steady" approach to submissions. I only submit 4-6 on any one day, and spread out my submissions from the same subject or location over multiple batches. I would never consider submitting 50+ assets at one time.
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