The answer to this is different everyday.
Some of my common ones are: post lots of notes, reply heavy, reply thoughtfully, zap hard, wear nostr gear, annoy irls with nostr talk, report bugs, make suggestions, try new stuff, or attempt to learn a skill that could help the cause.
Some more obscure stuff I've done: change the colors of the 'open' sign at my shop to purple & orange, planted purple & orange carrots, mailed shwag to plebs. 
Most importantly though: show up 😊

nostr:nevent1qqsg9f2h002y2lejg9y7j7a473g4fz7e7l55lmvmuam8kzkp27gq8dspz4mhxue69uhhyetvv9ujuerpd46hxtnfduhsygplwuxkt5a8vj5utj6s8tsj8e3wcavc45p4mqmw92qs7wrh5azmyspsgqqqqqqsdw92q0 

 Intento hacer lo mismo todos, todos los días
Amar #nostr 🫡 

 🫂 one team, one dream 

 I'm only qualified to show up!  

 😂 that's the most important one! 

 You don't want to be annoying.
Leverage people's emotions: for example when people complain about twitter censoring something, propose Nostr (in a gentle way) 

 I was using it mostly as an expression, though I'm sure my closest people probably do get a little annoyed sometimes.  

 meh, they would be making a bad move to let it divide you tho 

 Aww🥰 I'm fortunate to have a few people around who don't consider me expendable & they get the full gambit, for better or worse😂 

 I keep raving about it with my wife. She has just started face palming herself everytime.