How Many Images Should I Upload Daily to Boost Sales on Adobe Stock?

Upscaling tenfold is not a sign of quality. 

Designs for print on demand: you don't control the use of your assets.

Abstract wallpapers: they are abundantly in the database, so expect low sales.

Seemless pattern: if they are really seamless, they may be successful.

Cutout objects are probably your best bet, if the quality of the cutout (and the object) is good enough.

It is recommended to submit a few assets regularly, instead of submitting all at onece. Regular updates show that the account is alive and new items get a better visability, which will help in overall your account.

However, there is no magic formula. Submit quality assets only.

Adobe has always recommended a "slow but steady" approach rather than mass uploads. 5-10 assets per day is what I strive for. However, you also need to consider how competitive your asset categories are. There are more than 1.7 MILLION assets in the database tagged with "abstract background". I think it's safe to say that this category is already saturated, and that means that Buyers are probably not going to see or license your assets.

The Adobe database is saturated with wallpapers, whether they are abstract, geometric, or seamless—it doesn’t make much of a difference.
Trying to figure out what is in demand is the biggest challenge for contributors.
Having a very diverse portfolio and regularly uploading high-quality assets is key.

Your first three categories in particular are boring and probably will not generate sales. Anyone can produce such assets with little or no graphic experience or talent.  

We cannot give you a 100% solution.
The guidelines are well known:

1- Have assets that are in demand.

2-Have assets in genres that are not overpopulated in the database.

3-Have quality assets in diverse genres.

4-Have well thought out keywords and titles.

5-Continue regular uploading.

6-Build a large portfolio.