I just had a game where my teammates wouldn’t buy after winning the first round despite me telling them to buy. Was I right to buy anyways despite my teammates or would it have been better to save in that situation?

So I've recently hit D1 and found that a lot of the game relies on communication and comboing util with teammates, which makes a lot of my matchmaking experience very team dependant. I can no longer carry games as often, and get frustrated...