Reborn your Stymp Bird so that it'll learn Quick Strike. It'll be quite good to put a Quick Striker behind your Ace Thor.
Save up your stat iii, then you can trade for some decent 5* that can replace the 2 4* guardians in your deck.
I'd try to reborn the Cthulhu too cause it's quite a good guardian, but unfortunately its ALM version just came out so its price hiked a little.
The Gremory & Forneus can valued at 5 stat iii each, so both of them plus your current 6 stat iii....you have 16 stat iii. With 20+ stat iii, you could get a decent 5* guardian already.
Ace Qiong Ji and Revenant is kinda old already, Qiong Ji is only good if it has Phy+3 skill. After you've traded the Forneus & Gremory, I'd think Qiong Ji & Revenant should be next in line to be traded.
For you, I'd recommend getting a Fast or Int Old Gilgamesh. It's relatively cheap (max 15 stat iii in my opinion) but it's still good, I'm using a Sonic Old Gilgamesh in my deck until now haha.
Thanks for your advice.
BTW, anyone got Light feeders for trade? Ehehee.....
I have spare lvl 55 fast angel.. not sure it suitable as feeder or better rb it