I used to ignore souvenirs until I saw how much people paid for certain match-related skins. It led me to find some resources to really understand the market. One that helped a lot is https://dmarket.com/cs2-wiki/  it’s where I learned how to Explore, Trade, and Master the Art of CS2 Skins. It breaks down what makes souvenir skins desirable and when to hold or trade. That site helped me avoid dumping rare ones too early.