Transaction fees are driven by transaction volume. The more congested the network, the higher fees will be because there's a limit to how many transactions can

Transaction fees are driven by transaction volume. The more congested the network, the higher fees will be because there's a limit to how many transactions can fit in a block. If there's normal transaction volume on the network then transaction fees will remain the same. Miners can choose to reject any transactions but equally they'll also be miners who accept any transaction.