Being proactive and open to new people is the key to making friends as an adult. You need to seek out friendships and be willing to get to know new people and try new things. Joining clubs or organizations focused on finding friends can be a great strategy. There are also websites and apps that can help people find friends either online or in their local area. Being more outgoing and talking to people you meet in your day-to-day life can also be a great way to build new friendships.