I'm currently on Rank 5-2, 2 missions away from fighting the Jelly Boss as part of the story mode. Right now, I have been rewarded with 3 Advanced Orbs and some recipes to upgrade my 2-Stared Cobalt Armor Set and Weapons to their 3-Stared variant. However, I don't have enough Orbs to craft the entire set, meaning that I will have to farm crowns to get energy to purchase them from the market, or I'll just have to keep grinding in order to, hopefully, get the as drops.
My question is, what would be better? To save up my money and resources for when I'm able to build a 4-Stared Set or to just arm myself with 3-Stared gear until later? I feel like if I'm just patient enough I will be able to beat the rest of the missions with my current 2-Stared set and then I will gain access to 4-Stared gear which will definitely require me to have a lot of resources to make.
I love this game and I'm having a lot of fun, but it really feels like I've reached the point where, if I don't grind for hours, I won't be able to keep moving on without dropping cash to consistently arm myself to be ready for the following missions.
If I were you I'd try to just chill out and take things slow. Go on runs you want to go on, and do what you like. The orbs and stuff will come naturally. The game's pacing is wack, so you don't need to be ready for that next mission ahead of time.
As for a direction I'd recommend working towards chaos cloak + mask of Seerus.. but how you get there is really up to you.