I want to make my AWS Transfer Family SFTP-enabled server accessible using Elastic IP addresses.
To make your AWS Transfer Family SFTP-enabled server accessible using Elastic IP addresses, create an internet-facing endpoint for your server.
However, if you must change the listener port to a port other than port 22 (for migration), then see How can I enable Elastic IP addresses on my AWS Transfer Family SFTP-enabled server endpoint with a custom listener port?
Lift and shift migration of SFTP servers to AWS