The House and Senate can check the court with the President’s support.

• Justices can be impeached by a 2/3 majority in the Senate.
• They can have term limits introduced to stop lifetime appointments.
• They can have the court size shrank, removing some members.
• They can have the court size increased, making the individual vote count less.
• They could introduce a rule to require a supermajority in the court to declare a law unconstitutional.
• Impose new ethics rules for justices (thereby removing the corrupt justice).

So if we want to peacefully fix the court we need a Congress that can work with the President to do that.

Sources:

https://www.lwv.org/blog/not-so-absolute-power-supreme-court

https://www.brookings.edu/articles/term-limits-a-way-to-tackle-the-supreme-courts-crisis-of-legitimacy/

https://crsreports.congress.gov/product/pdf/R/R47382#:~:text=Court%20can%20declare%20a%20law,recordings%20of%20Supreme%20Court%20proceedings.