Just having a network of care, looking out for each other and replacing functions a fascist state doesn’t offer any more (think childcare/healthcare/food for those in need) can be a huge act of resistance. Organizing political protests as long as it’s still possible (even if it’s illegal). Strike, sabotage, physical violence … Eventually you will have the choice of imprisonment/death, assimilation or exile to me the last act of resistance will be never to choose assimilation. Continuing to live in exile can be as much of a martyrdom as dying for the cause.