We could try many things, if the political will were there and the voting public had an attention span greater than that of a squirrel. We could have kept building the wall system then augmenting it year by year with emerging technologies as they became available. Might not be a cure-all, but something is better than nothing. We could set up systems of incentives in the most common countries of origin that wouldn't blow up our budget and would allow us to funnel would-be immigrants to industries in need if the individuals so approved had demonstrable and needed skills, training, and/or education. We could do a better job of carrot and sticking the governments of the most common countries of origin. We could stop defunding police and instead empower them to work closely with immigration and border patrol personnel. There are hundreds of things we could try that might actually happen in the real world. But it just feeeeeeeeels better to vent your impotent rage at a problem you personally will NEVER do a damn thing about.