I have a perfect farming strategy for you: taking on Might Shadow Roc(148) from house ID# 35950899
I see that you already got Shadow of Doubt G, you should replace it with Contradiction Cuirass from the Mystery! quest to bring the light/dark res down to 60. Next, get Guardian Luminous Shield (-17 dark/light res) and Crystal of Restless Shadows G (-5 dark/light res) from Seekrat - The Breaking Point and The Final Countdown quests. You will now have 38 res in both elements. This is good, but it can get even better.
To further increase your chance in slaying this high level monster, you should also get the geocastellum armor (from Walric's mastercraft quest with the same name). Keep in mind to Only get the lowest tier armor, as you only need its skill - which will reduce the damge you take. If you have z token to spare, you can also try and get Gandolphin spell from the rare golden giftbox reward (talk to Valencia, and remember that guardian gets 1 free box per month). It is not impossible without Gandolphin, but it will make things easier. Finally, train Wizard and get Generalist's Robe (though if you don't have Gandolphin then this is not needed) as well as Assasin to lv 5 to get the intiative boost (you can untrain your end to get around 140 luck to get the first strike, but keeping 110 end and tank the first hit is ok as well)
When fighting the Shadow Roc, equip the gears, then use the skill from the geocastellum armor and use generalist's Arcane Lore before casting Gandolphin (again, this spell can be passed if you don't want to spend z token on it). After that, use Call Ally in this order: Zorbak -> Artix -> Artix again and again until the Roc die (this should take around 4 Call Ally) and Done, the Roc is dead, and you net a huge sum of 3,220,000exp/644,100gold, enough to pass your current cap.
I have been using this strategy with my hybrid mage since she was lv 85 (non guardian, though I do have Gandolphin) and instead of putting points in end, I trained luck in order to get the first strike. However, this should still work well for you. Once you get through lv 110, you can then move onto other foes like the Queen Bee from the Anniversary quest (after using all 4 Call Ally to beat the Shadow Roc and still haven't reached the level cap). Have fun farming!