In Bonga's second season with the Wizards, the forward saw a limited role but was able to decrease his turnover numbers from the year prior. The third-year German notched season averages of 2.0 points, 1.7 rebounds and 0.6 assists in 10.8 minutes. Bonga hit 37.0 percent from the field, 62.6 percent from the free-throw line and 27.7 percent from behind the three-point arc. The forward played in 40 regular-season matchups and got the start in eight of those games. One of Bonga's best performances of the season came versus the Magic on Dec. 26, where the 21-year-old recorded season-highs of 10 points and two blocks. Defensively, Bonga was able to record 11 steals and 10 blocks on the year. One area of improvement for the young Wizard was his turnover average, as the forward decreased his average from 0.9 in 2019-20 to 0.6. Another impressive performance for Bonga came on Jan. 24 against the Spurs, where he dropped seven points, seven rebounds, an assist, a steal and a block in 33 minutes. The German product established himself as an exceptional rebounder, finishing the season with 19 offensive boards. While Bonga didn't receive many playoff minutes, the forward did log three points, a rebound and an assist in his play-in debut.

Bonga appeared in 58 games for the Wizards during the 2019-20 season. He averaged per-game career highs in points (4.6), rebounds (3.2), assists (1.1), steals (0.6), blocks (0.4) and made three-pointers (0.4). He also posted career-highs in field goal percentage (52.2), three point percentage (40.0) and free throw percentage (81.3). Bonga reached new single-game career highs in points (17), rebounds (nine), assists (four), threes (three) and blocks (two). He had four double-digit scoring games, 16 games with at least five rebounds and 16 games with multiple assists. He also had 10 games with multiple steals and 20 games with at least one block. Bonga's longest streak with at least one point, one rebound and one assist was the opening six games of the season (Oct. 23 through Nov. 4). During that stretch, he averaged 5.5 points, 4.0 rebounds, 2.0 assists and 1.0 steals in 23.1 minutes. In the 12 contests in which Bonga played at least 24 minutes, he averaged 6.5 points, 5.2 rebounds and 1.6 assists. He shot 52.5 percent from the field in those games.

Bonga joined the Los Angeles Lakers after being drafted 39th overall in the 2018 NBA Draft. He played in 22 NBA games during his rookie campaign. The bulk of Bonga's playing time came in March and April, and he played in the final nine games of the season. He made his NBA debut Dec. 7 against the San Antonio Spurs. On April 4 he came off the bench to score four points against the Golden State Warriors. Bonga played a career-high 19 minutes in the penultimate game of the season, a 113-109 win over the Utah Jazz. He spent the majority of the season competing for the South Bay Lakers of the G League. At that level, Bonga played in 31 games and made 29 starts. He averaged 11.9 points and 6.2 rebounds per game. His 1.1 blocks per game ranked second on South Bay.