I understand being frustrated with the two-party system but given what we've got now, voting for anything other than the democratic ticket is detrimental to your views. Voting third party in our current political climate can literally only help Republicans.
As I said in another reply, until we have national ranked-choice voting, voting for a third party candidate is not in any way helpful, no matter how much you dislike the party. At the end of the day, it's going to be far better having a Democratic majority and president than anyone from the GOP, who are an existential threat (climate change, reproductive rights, class equity, etc).
The reply from mpa92643 that your reply is under went into detail about all the things that Biden and Democrats have done over the last few years. If you don't think those are massive triumphs given the political climate and the very narrow majorities the Dems had, I don't know what to tell you.
Those are things that weren't just stopping bad things from happening.
Edit to address your question as well: the most substantive thing you can start with is voting Democrat and not any third party. Giving Democrats consistent and large enough majorities to combat the gerrymandering is vitally important to actually moving the country forward.