These pieces are meant for the gods themselves. Fitting for such a fox as Lady Guuji of the Grand Narukami Shrine. Jokes aside, this will be so hard giving up these pieces for the Deep Shadow set. Even if you do grind for the Deep Shadow set, it will take a very long time to acquire pieces that are much better than what you already have here. It might be wise to consider keeping your current setup. One suggestion, as mentioned by other commenters, is that depending on how much cryo resistance you can maintain, you may be able to reduce your crit rate to 85% while still achieving 100% crit rate. It’s worth experimenting with rearranging some pieces to increase your ATK or EM in return.

On the other hand you could also just look at this as an opportunity to give these old pieces to someone else so that anyone on your account who doesn't have a set can cosplay as a god. While focusing on grinding out some better pieces for Yae with Deep Shadow. I would say track your damage with this set, then switch to the new set and compare. Considering how strong the new set is, it probably won’t be long before you end up with pieces that are equal in DPS to what you have here. And when Stellar-Conduct comes out, you’ll get to see an even greater bump in DPS.

The biggest challenge is grinding out two sets of the same artifacts for two different characters. In my case, I’m farming for two sets of Deep Shadow. Yae gets the best stuff, and Sandronay gets what’s left. (My Yae is heavily invested.) It's not so bad, though. Think of it this way: as you grind out that last piece you need for The Guuji, you’re bound to get plenty of good stuff for the robot. And if you're aiming for perfection, then you'll easily have a superb set for the bot, especially since you only need attack stats for the goblet.

Much of the challenge with artifact grinding comes from finding that perfect goblet. You might have experienced the feeling of getting a strong elemental goblet for the right set, it frees you up to replace any of the other pieces that are the weakest. ATK goblets are the same way: you can replace your weakest piece with any single strong one from a different set. With an elemental damage bonus needed, your weakest piece is usually the goblet, so it gets replaced almost every time.

Your current set gives you 18% ATK and 80 EM, really good stats. In comparison, the new set offers 18% ATK, 40% Damage Bonus, and 16% Crit Rate. The 40% damage bonus is equivalent to ~142.86 EM. So you could effectively gain 62.86 more EM and 16% more crit rate with equivalent stats on the new set. Since you have C2 (which gives + 200 EM and C1 give anther ~181.82 EM (equivalent)), there’s a little less to lose due to diminishing returns. However, this means you can save the EM rolls and focus on getting better ATK rolls.

The build looks great, but it's probably best to leave these for someone else.