Welcome back!
First and foremost thing is level up as fast as you can and make sure to do daily quest everyday and once you hit level 71 start buying the stuff which the above players have mentioned.
Also try to run as many events as you can cuz these events will fetch you a good profit so you will have good amount of gold to buy high level gears.
Try to settle with Lower level legendary gears now once you get enough gold then only buy higher level gears like tainted set etc.
All the best!


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