If it were up to me, there'd be Block and Parry actions.Yes. Its a failing of the edition that they limit magical items so much, and Fighters absolutely should get more of them, and be better at swinging them at critters and cutting off their heads.
The Fighter would get Extra Attack, Extra Block, Extra Dash, and Extra Dodge
The Block action adds you +1 to AC and Strength saving throws and adds +1 more holding a shield but halves your speed.
Extra Block (X) adds +X to AC and Strength saving throws and adds +X more holding a shield.
The Parry action adds your proficiency bonus to your AC versus the next melee attack that hits you.
Extra Parry (X) adds it you the next X attacks
Extra Dash adds +X feet to your speed when you dash