Building relationships in Animal Crossing: New Horizons can be such a fun aspect of the game! One of the best ways to increase friendship levels is to talk to your villagers every day; they really appreciate the attention. Giving them gifts they prefer, like their favorite fruit or some DIY items, works wonders too.
I've found that interacting with them during special events and completing tasks for them helps strengthen those bonds as well. Also, don't forget to send them letters! Personalizing those with gifts inside can really make them feel special. What are some of your villagers' favorite gifts? I've been focusing on trying to get my favorite ones to like me more!