The issue that I am passionate about is election reform. Including things like getting rid of gerrymandering, making voting more accessible, making the houses more representative of the people, and breaking down big donor influence on elections and policy. Neither of the big two parties comes close to making any of this happen.
If these things are not fixed, the parties in control can do whatever they want. They can keep us divided by shouting about one passion-based issue in public then doing nothing about it while serving big donor interests in legislation.
I don’t see how any mainstream issue matters when you can’t trust elected officials to act on any issue you care about. That is unless you are one of the self-interested donors who writes your own bills. Then it still doesn’t matter which party is in power because you can control them both.