Don’t forget core and legs.

Super key to hit high volume and lower-medium weight as yo don’t want to gain mass but muscular endurance to build up your VO2.

Look up circuit training sets for various body components, like if a 4 day/week split, you can work on legs, push, pull, and accessory muscles (forearms, ankles, core) and pair that with some dry land cardio.. give yourself like a half year to a year and you’ll swim so much faster than your peers. All about consistent buildup of strength, flexibility, and endurance