Local rapid response networks exist to help intimidate ICE whenever they appear. Local soup kitchens and other similar charitable organizations can use your help, as the people who are most often targeted by this administration are those who are already poor.

Go to local meetings any time someone proposes legislation that harms marginalized people, expands surveillance measures (e.g. ALPRs), or alters the favor of elections towards the far right, and make your voice heard. You can also comment on regulations.gov whenever certain legislation is put out, and your state legislature should have a way to contact your reps there, too. Our representatives aren't fully beholden to us, but they're known to cave under public pressure, and every little bit of pressure helps.

Donate to organizations that slow down the effort of the administration, like the ACLU, or more specific ones for any given issue (e.g. the FFRF for religion-related fascist policy prevention, the EFF and Fight For the Future for digital rights and surveillance, Climate Defiance for both climate and general political activism that disrupts bad politicians and billionaires where they live and work, the Internet Archive for archiving information the administration tries to take down, etc)

You can also just go to nearby protests. Check out 50501 and Mobilize for a lot of more common ones you can expect to find a lot of people at, but also just figure out other local groups in your area that might be holding events, marches, protests, boycotts, etc.

Speaking of that, boycott businesses that support the regime when you can. Boycott Here, BDS Movement, Boycott Citizens are all good resources, and there are always more targeted campaigns like QuitGPT.

Do mutual aid for your neighbors who need it, get a whistle you can use if ICE shows up near you (remember, 3 long blows is ICE nearby, long blows is ICE detaining. If you hear whistling from someone else, get out there, record, and use your own whistle to make sure others do the same!), canvass/phonebank for local candidates, or even candidates in other cities/states, to get local policies implemented to make your communities more safe. Progressive Victory is great for that. (though it does require you using Discord)

Outside of that, you can always show up to your local ICE facility and just generally be a nuisance. They hate that shit ;)