Every player have a segnale & a main character.
That would be your best option, Max your segnale then after that you can start farming / creating gears for your main char.
The duration of you completing a full set can vary, it also depends on luck when it comes to upgrading items to +13. You can farm argates convert them to narukes then you can get DK’s then you can buy part items for your main character.
Maxing a character shouldn’t take you a week, specially now that 2x drop and 3x exp is on the whole time due to the crisis ( best time to farm too)
I hope this helps you a little bit, I hope you meet some nice people in ardeca to guide you too or help you out!