Please answer my question,

I've never tested the Upload threshold.  There might be a limit at some point.  If you reach it, let us know. 😘

Upload as many as you want. Submit as many as you can.

If your acceptance rate diminishes, your submission threshold will diminish. So submit only assets that have a high quality. If your sales rate diminishes, your submission threshold diminishes. So submit only assets that are high in demand.

If you post in the wrong forum, a moderator will need to move your post. 🙂

Whatever you do, there are consequences. 

I think your strategy is a good one. You can upload as many as you want, then slowly add titles and keywords and submit in a steady stream. In that manner, you'll probably not even be affected by the weekly submission limit and will also have a steady stream of reviews and, hopefully, acceptances. Adobe has always recommended a "slow but steady" approach to submissions.

Assuming things remain the same as they were before the weekly limitation, you'll be able to upload an unlimited number of assets under your New tab in order to prepare them with titles and keywords, if I recall. However, there is still a limit to the number of assets that you can have under the review tab, being either 51, 501, or 3001. It's been so long since I've reached my under review limit that I'm no longer sure you can prepare an unlimited number of assets in advance of being submitted and reviewed. But you can try and see what happens.