I started contributing to Adobe Stock about 8 years ago, and even though the database was much smaller than it is now it took 3-4 weeks before I got my first sales.
You need a substantial portfolio, 2,000+ images with a variety of themes. Sales can be affected by seasonality. If you have many seasonal assets, they'll only sell prior to the season that they portray. If your assets are in very competitive categories, for which thousands of similar assets are already in the assets with the same keywords, it's possible that Buyers aren't even seeing your images. If they're many pages down in the search results, Buyers won't spend that much time reviewing and selecting assets. Look for unique topics and submit only the best quality assets.
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