Resuggestion, thanks to Blaze for the info!

Sale 1:

https://backpack.tf/profiles/76561198302384193#!/compare/1582934400/1583020800

https://backpack.tf/profiles/76561198418740133#!/compare/1582848000/1582934400

Bulk

sale 2:

https://backpack.tf/profiles/76561198418740133#!/compare/1583625600/1583798400

https://backpack.tf/profiles/76561198377298887#!/compare/1583712000/1583798400

Sold for Leak Mullet

Use there

sale 3:

https://backpack.tf/profiles/76561198377298887#!/compare/1585008000/1585094400

https://backpack.tf/profiles/76561198095022965#!/compare/1584921600/1585094400

Bulk

sale 4:

https://backpack.tf/profiles/76561198095022965#!/compare/1586995200/1587081600

https://backpack.tf/profiles/76561198315881059#!/compare/1586995200/1587254400

Sold for 19 keys

sale 5:

https://backpack.tf/profiles/76561198131852014#!/compare/1585353600/1585958400

https://backpack.tf/profiles/76561198094382760#!/compare/1585872000/1585958400

sold for DP Screamin + 2 keys

use there, only sale.

sale 6:

https://backpack.tf/profiles/76561198094382760#!/compare/1587513600/1587600000

https://backpack.tf/profiles/76561198179584474#!/compare/1587513600/1587600000

https://backpack.tf/profiles/76561198037674114#!/compare/1587254400/1589932800

Untrace

Sale 7:

https://backpack.tf/profiles/76561198171312782#!/compare/1586390400/1587427200

https://backpack.tf/profiles/76561198850274253#!/compare/1586304000/1586390400

QS

sale 8:

https://backpack.tf/profiles/76561198834678807#!/compare/1586476800/1588377600

https://backpack.tf/profiles/76561198165440514#!/compare/1587772800/1587859200

Untrace

sale 9:

https://backpack.tf/profiles/76561198165440514#!/compare/1587859200/1587945600

https://backpack.tf/profiles/76561199045831455#!/compare/1587600000/1587859200

https://backpack.tf/profiles/76561198120672630#!/compare/1587859200/1587945600

https://backpack.tf/profiles/76561198985910282#!/compare/1587945600/1588809600

Untrace

sale 10:

https://backpack.tf/profiles/76561198985910282#!/compare/1589587200/1589673600

https://backpack.tf/profiles/76561198257203147#!/compare/1589500800/1589673600

Can trace keys

sale 11:

https://backpack.tf/profiles/76561198257203147#!/compare/1589673600/1589760000

https://backpack.tf/profiles/76561197995983788#!/compare/1589673600/1589760000

Bulk

sale 12:

https://marketplace.tf/items/tf2/445;5;u58

$39.99 / $1.69 = 23.66 keys

$34.65 / $1.9 = 18.23 keys

Total sales @:

18, 19, 24 keys

months unsold at 18 keys,

month unsold at 17 keys,

Blaze’s Part:

this is definitely too high given all sellers are below 19. this includes sellers at 15, 17, 18, 18, one of which are 8 months old.

New sales:

Sale 14

https://backpack.tf/profiles/76561198131983415#!/compare/1590364800/1590537600

https://backpack.tf/profiles/76561198119424779#!/compare/1590537600/1590710400

Sold for 15 keys

Sale 15:

https://backpack.tf/profiles/76561198119424779#!/compare/1593129600/1593302400

https://backpack.tf/profiles/76561198095022965#!/compare/1593129600/1593302400

Bulk

sale 16:

https://backpack.tf/profiles/76561198037674114#!/compare/1591315200/1591142400

https://backpack.tf/profiles/76561198850274253#!/compare/1591228800/1591315200

QS / Bulk

sale 17:

https://backpack.tf/profiles/76561197995983788#!/compare/1590883200/1591056000

https://backpack.tf/profiles/76561198295038063#!/compare/1590969600/1591056000

Sold for ~14 keys

sale 18:

https://backpack.tf/profiles/76561198295038063#!/compare/1592179200/1592265600

https://backpack.tf/profiles/76561198993686702#!/compare/1592092800/1592179200

Untrace

sale 19:

https://backpack.tf/profiles/76561198993686702#!/compare/1592438400/1592524800

https://backpack.tf/profiles/76561198027302727#!/compare/1592438400/1592524800

Untrace

sale 20:

https://backpack.tf/profiles/76561198122096342#!/compare/1593475200/1593561600

https://backpack.tf/profiles/76561198002757046#!/compare/1593475200/1593561600

QS

sale 21:

https://backpack.tf/profiles/76561198315881059#!/compare/1591920000/1593043200

https://backpack.tf/profiles/76561198164651434#!/compare/1592956800/1593043200

Untrace

sale 22:

https://marketplace.tf/items/tf2/445;5;u58

$39.99 / $1.98 = 20.20 keys

it would make more sense to make this 14-15 given the sellers and that these are more recent sales.