Ryanair has placed an order for 150 Boeing 737 Max 10 aircraft with an option for 150 more. These planes will replace many of the planes in their current fleet and are larger than anything they now fly. Deliveries between 2027 and 2032.
I'm guessing Ryanair believes travel will just continue to increase in years to come. Don't expect Europe to get any less crowded.
https://www.cnbc.com/2023/05/09/ryanair-boeing-plane-order-for-737-10-max.html