Sales and visual approval decline

You simply can't speed up the moderation, the waiting time is related to the overall submission time of all contributors.

When you have a decline in sales, it may have multiple reasons. There may be more assets to choose from (Adobe adds new assets at an incredibly high speed), there may be less buyers and your assets may just be not asked for.

What @Jill_C said. You also might want to consider tweaking your titles and keywords in the files that have been accepted to date, though since your sales were pretty consistent in the past, this might not be the reason for slow sales. It may also just be the nature of retail, which we are basically in, but without the hassle of dealing directly with the public. One can, for example, walk into a restaurant on the same day and time every day and on one day the place is empty, while the next day it's packed. 

Review times have grown longer and longer this year due to the huge influx of Generative AI assets which have swamped Adobe Moderators. Review times of 2+ months are common for illustrations, including Generative AI, and are now >3 weeks for photographs. There's nothing you can do to hasten the process.

The best way to increase your sales is to research and understand what type of content Adobe is looking for. Check out the Insights and Artist Hub links on your Dashboard page. The Adobe Stock Discord channel occasionally has calls for content, curation corner, and inspiration threads. Before you decide what content to submit, go to the Buyer webpage and search for images in the same keyword / subject area that you're thinking of submitting. If there are already thousands or millions of images in that category, the chances that yours will ever be seen or licensed are slim. For instance, red roses, sunsets, any time of flower unless it's a rare species - don't even bother!