PSA if you are still not yet 1400
If you are still stuck in the 1300s trying to minmax to not waste resources.. just do it. Spend those shugo festival currency on daeva crystals. +5 those crappy blue items you know you'll just replace. Break free of that autism death spiral and get going.
A lot of content creators stressed the importance of hitting 1400 with zero gear upgrades. You are not going to miss the 500k kina and the enhancement stones are completely refundable.
I understand the importance of clearing the feathers, completing the quests; you'll have to do it anyways very soon for 1900 or 2100 gs. It was overall a good message for the greater community to hear. It helped everyone understand the broad concept to focus on vertical progression instead of wasting all their kina. Now I see tons of people stuck at 1300 desperate for advice on what to do.
Just spend the resources. The 6 hours you spent agonizing over how to save would be 100x more effective spent leveling an alt to run duties, expidition and Shugo festival to sell mats to whales before the market gets saturated after October 5.