Opened this after 3 years of trying to get something good

Hi guys! I opened this case yesterday by accident while doing work and opened up a Vanilla Stiletto knife. I’m not sure what to do with it because ive rarely had anytbing of even tiny value in my account, what’s the best way to estimate its value? (It’s different everywhere I check) I’m also open to offers trade wise if someone really wants it maybe (but I understand the risk of phishing links and people trying to scam so preferably reduce the bs if that’s your goal) , tbh I’ve never had an item worth this much so I’m kinda confused what I do, is it worth holding? I never really understood the value of cosemetics in games much but maybe now I’m getting it lol