Make some baked goods or bread and drop it off. I like to use the excuse of “I accidently made too much, would you like these?”

Go ask to borrow something they will have. Everyone likes feeling helpful

Make them food and take it to them. Invite them over for a bbq. I found that the best way to make friend is be friendly. Strike up a conversation and let them do most of the talking. People love when others are interesting in something that interests them and they get to walk about it.