Biden can put back in place some of the Trump policies Biden so stupidly struck down.

You speak lawyer talk and I speak average citizen talk. Two different languages.
Difference is average citizen talk has common sense.

And ignorance of the law. Labelling something which is illegal as "average citizen talk" doesn't make it possible. It just means you're unaware of the legal constraints that make that "common sense" proposal the purview of the Congress, not the Executive.

Name the policy that Biden stupidly struck down that he could put back in place. It can't be Title 42, because the Covid emergency is gone and the courts (in response to conservative lawsuits) have adopted several new rulings that limit the ability to use medical emergencies to exercise Executive authority. It can't be Remain in Mexico, because Lopez Obrador has made it clear that he's not going to do that again, and his domestic political incentives have change. And it can't be building the Wall, because the Wall can't be effective against people who are not trying to evade detection when entering the U.S. (which is the problem population right now).

So what is it? What's the policy that you think Biden can unilaterally put back in place that would actually have a meaningful effect on migration flows?