In Miami, Heat coach Erik Spoelstra changed James's role to a more unconventional one. James spent more time in the post and improved his shot selection and accuracy on jump shots. He also learned how to work as an off-ball cutter in the Heat's "pass-happy" offense. Behind these improvements, James's overall scoring efficiency rose to historically great levels. During this time, ESPN's Tom Haberstroh called James's free-throw shooting his biggest weakness, describing it as "average". Upon returning to the Cavaliers, James began to experience subtle age-related declines in productivity, posting his lowest scoring averages since his rookie season in 2015 and 2016. His shooting also temporarily regressed, and he briefly ranked as the NBA's worst high-volume shooter from outside the paint. Despite these changes, he remained an elite offensive player who beat defenses with body control, strength, and varying attacking speeds.
During his stint with the Heat, James resided in Coconut Grove, where he bought a $9 million three-story mansion overlooking Biscayne Bay. In November 2015, James bought a 9,350 square-foot (870 m) East Coast-style mansion in Brentwood, Los Angeles for about $21 million.
By 2015, James was considered by many people, including his fellow NBA players, to be the "face of the NBA". His opinions have yielded significant influence on people who make important league decisions; for example, in 2014 he asked commissioner Adam Silver to increase the duration of the All-Star break, and the request was granted the following season. On February 13, 2015, James was elected the first vice president of the National Basketball Players Association (NBPA).
James and comedian Jimmy Kimmel co-hosted the 2007 ESPY Awards. In other comedic pursuits, he hosted the 33rd-season premiere of Saturday Night Live. He has also tried his hand at acting, appearing in a cameo role on the HBO series Entourage. In 2015, he played himself in the Judd Apatow film Trainwreck, receiving positive reviews for his performance. That same year, James's digital video company, Uninterrupted, raised $15.8 million from Warner Bros. Entertainment and Turner Sports to help expand the company's efforts to bring athlete-created content to fans. It is hosted on Bleacher Report and is used by several other athletes including Tampa Bay Buccaneers tight end Rob Gronkowski and San Francisco 49ers cornerback Richard Sherman.
James is an active supporter of non-profit organizations, including After-School All-Stars, Boys & Girls Clubs of America, and Children's Defense Fund. He also has his own charity foundation, the LeBron James Family Foundation, which is based in Akron. Since 2005, the foundation has held an annual bike-a-thon to raise money for various causes. In 2015, James announced a partnership with the University of Akron to provide scholarships for as many as 2,300 children beginning in 2021. In 2016, he donated $2.5 million to the Smithsonian National Museum of African American History and Culture to support an exhibit on Muhammad Ali. In 2017, he received the J. Walter Kennedy Citizenship Award from the NBA for his "outstanding service and dedication to the community." In November of that same year, the Akron School Board approved the "I Promise School", a public elementary school created in a partnership with the LeBron James Family Foundation to help struggling elementary school students stay in school. James later reflected that it was his most important professional accomplishment of his life. The school officially opened on July 30, 2018.