So Trumps wall was working great and then when Biden became president it just stopped working. Does that really make sense to you? Do you think it's a magic wall?
The reality is that the broken US immigration system can only be fixed by congress. Neither Trump nor Biden have/had the power to fix it. If any president were to blame it would be LBJ or Nixon for destabilizing Latin America 40 years ago. Executive orders may have some short term affect, but they can't solve the underlying issue. And the wall is nothing but a gimmick that Trump used to excite the mouth breathing xenophobes that worship him.
I don't know whether the wall has any magic attached to it or not. But please check the second graph that I posted in my previous reply. You can clearly see that border crossings went up by more than 5x as soon as Biden assumed power as the president of the United States. So what is the reason behind this? If Trump doesn't have the reason to fix immigration issue, then how did he kept the number of illegal aliens crossing the border low during his term? And why that number suddenly shot up once Biden came to power?