As you are using LOVE SERUM, which has many energies, that work on mind and soul level, use of switch words can be optional for you.
For any energy be it switchword too, just request 3 times (GOLDEN SUNRISE TOGETHER x 3) for you and your partner.
Pl check here the learning post by Sharat Sir.
https://forum.litairian.com/discussion/356/three-basic-parts-of-any-request-to-vk#latest
As you are a new User, you can also read the Discussions in BASICS OF VIBBES KADA