Property damage is the name of the game. Part of why the ira was so successful is that they tried not to kill civilians. They'd put a bomb next to something expensive, tell the police to get everyone out of the area and then blow it up.
That's the extreme example but you can do other things. Graffiti and breaking windows are super quick and easy and are real expensive to fix. Target damage to corporate buildings and private property, don't be the dick that vandalises public transport
I am far more familiar with what a gigabyte of information is than what an Eiffel tower of information is