With Marbury v Madison, the court gave itself the authority to interpret the constitution and the laws that congress enacts and the president enforces. These are statutory laws.
The other kind of law is court precedent. It is the law that the court creates based in the cases that come before it. It is inextricably linked to statutory law. Of course the highest court can overturn the law of lower courts or its own decisions.
Yes, the court can strike down laws.
The only way to get around the court is to amend the constitution itself. When amending, the language should be plain and clear so that SCOTUS cannot misinterpret it. Though there are several amendments that have been interpreted various ways over time.
Amending the constitution is a difficult process because it requires a lot of agreement between the members of congress/ senators and the states. See article V of the constitution.