Scarlett Johansson is set to reprise her role as Black Widow in three upcoming Marvel projects according to Giant Freakin Robot.
It is not known which projects she will be in but speculation suggests two of those will be Avengers: The Kang Dynasty and Avengers: Secret Wars coming in 2025 and 2026 respectively. These movies will be the climax of the current multiverse phase of the MCU.
Source: Giant Freakin Robot.