Congress has not and will not fix these issues. Congress has been and will continue to be so split along partisan lines that it is incapable of fixing these issues.
The constitutional issues cross political lines. Liberal issues include overturning the Citizens United decision, elimination of the electoral college, gun control, and others. Conservative issues include balanced budget, limited government, and others. Issues that may cross party lines include term limits on Representatives and Senators, term limits on Supreme Court members, and others.
The Constitution in Article V provides a method for states to propose amendments to the Constitution that bypasses Congress, an Article V Convention. An Article V Convention is the only way that these critical issues will ever be addressed.