I would like advice on increasing sales on Adobe stock.

• Contribute high-quality assets.
• Get nice titles for your assets.
• Get nice keywords for your assets. 
• Continue uploading high-quality assets. Check what is in demand for the moment. Adobe posts regularly a blog where they tell us what they expect and what is needed next.

Stock sales do not come automatically, just by contributing. There is no automatic get rich button. I would push it very hard. 

Try searching in the Buyer portal at stock.adobe.com using some of the keywords on your assets. This will help you to understand how many other similar assets you're competing with. If your asset isn't displayed in the first few pages, it may never be seen by potential Buyers. It could also mean that you need to improve your titles and keywords.

High quality, in-demand assets, plus thoughtful and accurate titles and keywords. If there's a "secret" to regular sales, we either don't know it or no one is saying. 😉 Also, a hundred videos is not a lot. You are competing against individuals with thousands upon thousands of assets in the database. Some do OK with as few as 700-800, but others require thousands, dependent on a number of factors of which I mentioned a few.