Question in regards to Ancient Weapons / Knockback mechanic

[jackies]

Hello,

I want to upgrade my weapon to Ancient, but I'm not sure if the Accessory it requests me to craft the weapon needs any specific stat.

Can it be any accessory? or will I lose stats?

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my other inquiry I already posted it in other post yet:

I was having issues in Lower until I switched from str to vitality.

What I found out is that since I switched my status points from str to vitality my character doesn't knockback the enemies (or pushes back the enemies per hit) anymore.

Yet I think my build would require switching to Str at late game to get the most of it.

That's why I ask you, does someone has information about this ingame mechanic?

I want to hit harder than I do now, but if a switch to str I think I would push the enemies back like before, making me unable to benefit from Sharp Melee (60% melee dmg within 4m)

Is there an equation or anything that helps me understand how much strenght is enough?

Anything that you might think would be appreciated. Thanks.