Or is there a review process every time I submit a new asset?
This topic has been discussed several times on the forum.
As far as we know, every time you create a project (whether it's just an asset or a downloadable game) or update an existing one, an algorithm evaluates whether your page should be inspected by staff.
If the algorithm determines that your page requires manual review, it will deindex it until a staff member reviews it and manually reindexes it.
To prevent malicious actors from exploiting this, the algorithm's operation is secret, and obviously, there's no way to circumvent it.
From what little has been said, certain factors are riskier than others, such as paid content, new accounts, etc. However, the fact that your account already has previously approved content doesn't guarantee that your new content won't have to undergo manual review.