It's also good to use bridges in most songs, and make sure that they make the song interesting and uplift the listener. By that, I mean that the bridge should set the listener up for a final chorus and vamp. Make the listener feel that the big finish is on its way. Embellish the chorus. Use a change in the rhythmic structure and introduce new instrumentation to make your chorus become as important as it needs to be.
Big choruses make big hits.
People want to sing along and tap their feet. Give them what they want. Read, read, read. All writers need ideas for songs. Many I've spoken with use books of all kinds for inspiration.