The term "more card-carrying" refers to someone who is an active member of a particular group or organization. Synonyms for this phrase could include "dedicated," "loyal," "committed," "devoted," or "hardcore." These words all highlight the level of involvement and dedication someone has to a particular cause or group. Other synonyms that could be used include "active," "participatory," "engaged," or "involved." If you wanted to convey a more negative connotation, you could also use words like "zealous," "fanatical," or "extreme." No matter which synonym you choose, they all capture the idea of someone who is deeply committed to a particular group or cause.