Well, perhaps if there's a Democratic president in four years, and they aren't afraid to break laws as much as Trump does, they could abolish ICE by withholding Congressional funding, destroying it the way this administration destroyed USAID, and reorganize other agencies to pick up the slack, which is how it was before 2003, when ICE was established.
Past performance estimates future results, and it shows that while Democrats don't actively make things worse, they also don't actively make things better. This is illustrated in the "ratchet and pawl model.
When the Republicans are in power they move things rightwards. When the Democrats are in power they don't move things in either direction. The net effect is a move to the right, and you cannot influence that by voting, and the overall rate of movement depends on how often each party wins, which you can influence by voting.
The chance that a third party wins and moves things leftwards is zero.
