Solberg grew up immersed in the world of rally racing, having attended WRC events with his parents from infancy. His grandfather and uncle are also experienced rally competitors. He began competing in crosskarting at the age of eight, winning his first race. Over the following years he accumulated multiple Norwegian and Nordic Crosskart championship titles before turning to conventional rallying.
Solberg launched his professional rally career in 2017 at the age of 15. Due to his age, one of the few places he could compete was the Latvian Rally Championship — he was still too young to drive the road sections, requiring him to swap seats with his co-driver Veronica Engan between special stages. He won his first rally in a Peugeot 208 R2. He returned to Latvia in 2018, finishing second in class behind eventual European champion Mārtiņš Sesks.
In 2019, Solberg stepped up to R5 machinery and dominated the Latvian Rally Championship, winning five consecutive events in a Volkswagen Polo GTI R5. One of those rounds, Rally Liepāja, counted for the European Rally Championship, giving him an ERC win on his debut against top-level international competition. He also competed in the American Rally Association Championship for Subaru USA, winning three of his six starts, including victory at the Olympus Rally on only his second outing.
Solberg made his WRC debut at the 2019 Wales Rally GB in the Polo GTI R5, showing stage-winning pace before retiring. That same rally marked his father's final WRC event.
In 2020, Solberg won the FIA ERC1 Junior Championship and took a WRC3 class victory at Rally Estonia while competing part-time in the WRC. He also won the Rally Sweden Lockdown during the COVID-interrupted season.
For 2021, Solberg joined Hyundai Motorsport with a planned WRC2 campaign. Unexpectedly, after his debut in the Hyundai i20 R5 at Monte Carlo, he was offered a top-level drive in the Hyundai i20 Coupe WRC at the Arctic Rally Finland, finishing seventh overall. He ended the season back in the World Rally Car, finishing fifth at Rally Monza.
Solberg returned to Hyundai in 2022 as a third driver for selected top-level events, sharing a seat with Dani Sordo and achieving a best finish of fourth at the Ypres Rally. Hyundai and Solberg parted ways at the end of that season.
Solberg joined M-Sport Ford for 2023 before switching to Toksport WRT and Škoda for a full WRC2 campaign. He won the WRC2 class at Rally Chile and finished sixth in the WRC2 standings that year.
He remained with Škoda and Toksport for 2024, winning three WRC2 events and taking the championship battle with eventual winner Sami Pajari to the final round at Rally Japan. Mechanical trouble and a crash in Portugal ultimately cost him the title, but his stage performance — more WRC2 stages won than any other driver in 2024 — reinforced his status as a front-runner.
At the end of 2024, Solberg left Škoda and signed with Toyota Gazoo Racing WRT and Printsport for a WRC2 campaign in the Toyota GR Yaris Rally2. The 2025 season brought his career to a new level. At Rally Estonia, given the chance to drive the Toyota GR Yaris Rally1 top car, he dominated the event with nine stage wins, taking his maiden outright WRC event victory. He went on to clinch the 2025 WRC2 championship with co-driver Elliott Edmondson.
Alongside rallying, Solberg competed in the RallyX Nordic Championship in 2017 and 2018, using his father's 600-horsepower DS3 that had won the FIA World Rallycross Championship. He finished second in the series in 2017 and won the championship title in 2018 with three overall victories.
Solberg lives in Gunnarskog, Sweden. His family's motorsport history — through his parents Petter and Pernilla, uncle Henning Solberg, and cousin Oscar Solberg — makes him part of one of rally's most prominent multi-generational racing dynasties. The 2019 documentary Born2Drive charted his early career, and the family also featured in the Discovery+ and TVNorge series Team Solberg. In 2024, Solberg joined Lando Norris' Quadrant Athlete programme.