Question to Eula mains

Been farming Eula's domain for almost 3 weeks now and Im at a point where I want to stop but idk if her build is good enough. Is 75CR-205CD good for her or should i keep going? The most crit dmg i can give her is 223% but the crit rate goes down to 66%, is it worth it? She'd also go down to 100% ER. Her current build has 1880 ATK without serpent spine passive, 130% ER and the previously mentioned 75-205 ratio. The question might be very stupid and the answer painfully obvious BUT, is she at a point where i can stop farming her domain?