Here is a starter link for anyone who might be interested in volunteering to work against money-bought politics. This is one of those few issues that has widespread support across all political affiliations, so you can definitely find one that matches with your political affinity.
In my opinion, all issues lead back to this one. Everybody has specific policies & issues that they care about, but we never arrive at voter-centric solutions because our politicians can’t afford to take our side. If you want national politicians to return to caring about their constituencies, please consider supporting a cause.