Resuggestion, thansk to Fish for the info!

Sale 1:

https://backpack.tf/profiles/76561198391481385#!/compare/1591228800/1591315200

https://backpack.tf/profiles/76561198851895221#!/compare/1591315200/1591401600

Sold for ~5.5 keys

sale 2:

https://backpack.tf/profiles/76561198851895221#!/compare/1591315200/1591401600

https://backpack.tf/profiles/76561198278170243#!/compare/1591228800/1591401600

Sold for 6 keys

sale 3:

https://backpack.tf/profiles/76561198278170243#!/compare/1591228800/1591401600

https://backpack.tf/profiles/76561198050655382#!/compare/1591315200/1591401600

Sold for 6 keys

sale 4:

https://backpack.tf/profiles/76561198050655382#!/compare/1591315200/1591401600

https://backpack.tf/profiles/76561198156383247#!/compare/1591228800/1591401600

Sold for ~6 keys

sale 5:

https://backpack.tf/profiles/76561198156383247#!/compare/1591401600/1591488000

https://backpack.tf/profiles/76561198106795971#!/compare/1591315200/1591401600

Can trace 3 keys

sale 6:

https://backpack.tf/profiles/76561198106795971#!/compare/1591401600/1591488000

https://backpack.tf/profiles/76561199033450344#!/compare/1591401600/1591488000

Sold with 3 keys for...something

sale 7:

https://backpack.tf/profiles/76561199033450344#!/compare/1591488000/1591574400

https://backpack.tf/profiles/76561198120798830#!/compare/1591488000/1591574400

Untrace

sale 8:

https://backpack.tf/profiles/76561198120798830#!/compare/1591660800/1591747200

https://backpack.tf/profiles/76561198061779536#!/compare/1591660800/1591747200

Keys?

sale 9:

https://backpack.tf/profiles/76561198061779536#!/compare/1591747200/1591833600

https://backpack.tf/profiles/76561198873539085#!/compare/1591747200/1591833600

Sold for DP Base Metal + ~0.5 keys in sweets

Base Mini:

https://backpack.tf/suggestion/5f266410fa54c136fe336af8

Suggestion for 6.75 keys

Total is ~7.5 keys

sale 10:

https://backpack.tf/profiles/76561198873539085#!/compare/1591920000/1592006400

https://backpack.tf/profiles/76561198886886042#!/compare/1591920000/1592006400

sold with ~1.49 keys in sweets for Smoking Airdog

use there

sale 11:

https://backpack.tf/profiles/76561198886886042#!/compare/1591920000/1592006400

https://backpack.tf/profiles/76561198178357626#!/compare/1589587200/1592006400

Untrace

sale 12:

https://backpack.tf/profiles/76561198178357626#!/compare/1592092800/1592006400

https://backpack.tf/profiles/76561198876179362#!/compare/1591660800/1593388800

untrace

sale 13:

https://backpack.tf/profiles/76561198310287050#!/compare/1588377600/1590796800

https://backpack.tf/profiles/76561198337734785#!/compare/1591401600/1591574400

QS

Total sales @:

5.5, 6, 6, 6, 7.5 keys

buyers up to ~5.5 keys,

2 month unsold for ~7.5 keys,

FishCrimes' Part:

Unless you have a good argument, I think 6 flat is better here. 7.5 hasn't been able to sell for 2 months: https://i.gyazo.com/4d19c5b0b927403351fd5232c90e70c2.mp4 and your sale at 7.5 is the only non-pure sale in your proposed range.