In 2018, Dhawan had two releases—Shoojit Sircar's drama October and Sharat Katariya's social problem film Sui Dhaaga. In the former, he played Dan, an aimless hotel management trainee whose life undergoes a series of changes when his co-worker goes into a coma. In a highly positive review, Anna M. M. Vetticad of Firstpost commended Dhawan for "effac[ing] his starry swagger and trademark cutesiness to play Dan"; Rohit Vats of Hindustan Times considered it to be his finest performance to date and wrote that "his humour is innate, but his understanding of pain and how it affects the human behaviour is even better". In Sui Dhaaga, Dhawan and Anushka Sharma starred as Mauji and Mamta, a newly-wed couple in rural India who begin their own small-scale clothing business. Udita Jhunjunwala of Mint reviewed, "Dhawan has perfected the template for playing a simpleton. He brings a similar naiveté to Mauji, albeit endearingly." For October, he received a nomination for the Filmfare Critics Award for Best Actor.
Dhawan has appeared in Forbes India's Celebrity 100 list since 2014, peaking at the 15th position in 2018, when the magazine estimated his annual income to be ₹495.8 million (US$7.0 million) and listed him as one of the highest-paid celebrities in the country. In the same year, the Indian edition of GQ featured him among the nation's 50 most influential young people and labelled him as the "most bankable star of his generation".