When/if you give a gift to someone during the holidays rn, says its from your new name
Straight up tell them!!! if up front confrontation is something you're good at, go for it!!!
If any of your friends/family is transphobic/homophobic/lgbtq-phobic, bring up lgbtq rights and stress the fact that they cant control it and that lgbtq people are people too before telling them about your name
When someone calls to you, correct them and then explain
If you play a video game where you can set your name, set your name as your new name and then play the game when other ppl around or play it with them