Everyone can choose the priority level of the transaction. Validators will process and execute the transactions with higher commissions - it’s a logical choice. They are interested in prioritizing transactions with a higher Gwei. That is, if you need to speed up the transaction, you just need to pay a higher price for gas. In the wallet interface, you will be offered the choice (‘Slow’, ‘Average’, ‘Fast’ transactions), or you can set up Gwei manually. One of the main problems with blockchain is that the growth in the number of transactions reduces its scalability. Sharding is a smart approach to solving the Ethereum scalability problem. However, the solution has its drawbacks. Ethereum's transition to the Proof-of-Stake is the need to eliminate the shortcomings that sharding entails.