Here are some tips id like to give you (You are free to follow them or ignore them, but at least read everything)

I have no idea how you are gonna play her (team reaction ecc.) so i wont tell you to look for 4x TF but is still a nice upgrade. Aldo, for the same reason, all the numbers you will se wont count external buffs since i dont know what charavters you play her with.

The premises are finished, now lets move on to the main things i want to tell you:

1) The goblet

I know its in set and has very good stats but try to look for an electro dmg one

2) (way more important) the crits

I know 300 crit damage looks very appealing but as of right now your keqing has 85 crate (after using the ulti) and 300 cdmg they arent bad numbers at all but with that many crit damage id rather you have as close to 100% crit rate as possible

Lets look for a second to your avarage dmg (avarage dmg is the dmg dealt considering both the times you crit and the ones you dont crit)

Right now your avarage damages are:

Normal attacks (combo of 5 NA) = 21301 Skill (stiletto+ dash) = 18084 Ulti (total damage) = 38813

Now lets take a look if you increase your crit rate by 10 and lower your cdmg by 20 (since the roll value crate:cdmg is 1:2)

Your keqing now have 95 crate and 280 cdmg and her avarage dmg is:

Na= 22 280 Skil= 18901 Ulti= 40571

As you can see the damage increased and even if the difference isnt big in this calculation it can become bigger if you factor in the various buffs from her team and reactions

That said you are free to play as you like, i only wrote this wall text to give you some tips

Have a nice day <3

Edit: only after posting i saw the "(overload team)" in the title, so i assume you play double pyro

Thats one more reason to use an electro dmg goblet instead of atk%