To be honest, Blademaster isn’t a good choice for a shield build, especially for a physical damage one. You should consider to re-specing your build into Dual-Wield Melee Cold or Pierce focus, but physical damage also is not impossible and atleast you have target farmable weapons
check this for physical focus
Check this for pierce
Check this for cold
But also I guess you can make a Trauma/Blade arc build with Targo set, just a sketch without affixes or optimization https://www.grimtools.com/calc/q2MwW60Z