The teenager scored the final goal in Liverpool’s 7-0 thrashing of Maribor in the Champions League on Tuesday.
Jurgen Klopp’s side had been struggling for goals in the league and Alexander-Arnold believes that their squad has always been capable of scoring.
“It was a really, really good win," he said.
"We came here with a game plan and we executed it perfectly. I think we sent out a statement to the other teams in the group.
"Prior to the game we watched their strengths and also their weaknesses and how we could exploit them, and we tried to stop them playing the way they like to play.
"The whole team knew we had the goals in us. It was just a matter of when and where, and it happened [here] and I think that might be the catalyst to get the ball rolling in the games we have going forward."
Liverpool were dealt a major blow over the international break as star winger Sadio Mane was ruled out for six weeks with a hamstring injury.
The pressure of scoring was placed on Klopp’s other attacking options, but Alexander-Arnold believes the likes of Mohamed Salah and Roberto Firmino can fill the void in Mane’s absence.
He added: "You need those hungry players who just want to score and to have them in abundance in our squad is really good.
"Even though we did kind of put the game to bed really early on, they still had a couple of chances and it was never over until it was over, to be honest.
"We went full throttle right to the very end and we got the goals that we needed."
The win propelled Liverpool to the top of Group E, level on points with Spartak Moscow.
They face Maribor at Anfield in the return leg in a fortnight.
Liverpool return to Premier League action this weekend with a trip to Wembley to face Tottenham.
