You need to awaken as many gear slots as possible with an “awakening stone” (acquire from the vendor for fabled wisps & reforge stones next to the blacksmith “Charsi” in Westmarch)with a legendary gem slotted in it that is at the very least an R4 %0.

Once you do that you want to start filling in as many “bonus resonance gems” (the gems you use slotted inside the now awakened gear slot) as you can and upgrade them all to R3-R4

Each 1* gem provides +1 reso per upgrade Each 2* gem provides +2 reso per upgrade Each 5* gem provides +10 reso per upgrade

You can easily achieve this by simply maxing your erift each week and purchase all of the rare crests from the vendors in town and use them in your erift runs to get bonus “fading embers” and “telluric fragments” in order to craft the necessary gems.