Except it has worked in almost every city that's done it. A strong police presence deters crime, there's no arguing that. Yes, you should also "fix underlying issues". Whether those issues have led to crime is debatable depending on what issue you're referring to.

Additionally, you need to fire every worthless DA cities like SF and NYC have. They deliberately go soft on crime and let criminals right back on the streets to commit more crimes. So, if you want a fix you can start there. Throwing money at homeless people and "minorities" is not a fix.