Sale 1 was for 12 keys:

https://backpack.tf/profiles/76561198278692271#!/compare/1591315200/1591833600

https://backpack.tf/profiles/76561198073500295#!/compare/1591747200/1591833600

keys match history-wise.

Sale here for ~13 keys:

https://backpack.tf/profiles/76561198073500295#!/compare/1591747200/1591833600

https://backpack.tf/profiles/76561198060458887#!/compare/1591747200/1591833600

8 keys used to buy Oiled, then 7 used to buy Baker.

https://backpack.tf/profiles/76561198060458887#!/compare/1591920000/1592006400

https://backpack.tf/profiles/76561198126167104#!/compare/1591920000/1592006400

Sold here for 18 keys

https://backpack.tf/profiles/76561198127838231#!/compare/1592697600/1592784000

https://backpack.tf/profiles/76561198347338996#!/compare/1592611200/1592784000

can trace some keys

https://backpack.tf/profiles/76561198312449240#!/compare/1593129600/1593216000

https://backpack.tf/profiles/76561198358482558#!/compare/1593043200/1593216000

QS to bot

https://backpack.tf/profiles/76561198314211872#!/compare/1595376000/1596067200

https://backpack.tf/profiles/76561198067716129#!/compare/1586044800/1596672000

https://bot.tf/stats/item?def=31058&q=5&ef=Vivid%20Plasma&craft=1&aus=0&ks=0&source=browser_script

Likely for 18 keys (bot.tf)

https://backpack.tf/profiles/76561198169261981#!/compare/1592179200/1592265600

https://backpack.tf/profiles/76561198093438754#!/compare/1592179200/1592265600

Sold for 12 keys

https://backpack.tf/profiles/76561198093438754#!/compare/1593302400/1593388800

https://backpack.tf/profiles/76561198302033100#!/compare/1574467200/1593734400

Can trace at least 10 keys, likely more.

new sale:

https://marketplace.tf/items/tf2/31058;5;u16

$36.99 / $1.92 = 19.27 keys

https://backpack.tf/item/8801891441

note that pyro the engineer in the history sold for ~7.5 keys to someone who listed it on MPTF.

https://backpack.tf/item/8297395533

https://backpack.tf/profiles/76561198358296372#!/compare/1593554400/1593640800

https://bot.tf/stats/item?def=31058&q=5&ef=Vivid%20Plasma&craft=1&aus=0&ks=0&source=browser_script

sale here likely for 15, but can't prove.

so you're total sales are now @:

7.5, 9, 12, 12, 12, 13, 15(?), 18, 18(?), 19, 21 keys

I'm not sure where you pulled one of the 15's from, as there was no evidence i saw of that?

currently a seller on classies, unsold for ~2 weeks for 20 keys,

and buyers up to ~11 keys.

there are too many low sales to ignore, imo.

Better to resuggest this at 12 - 18 keys.