The son of former Wigan Athletic and Honduras star Maynor Figueroa, Keyrol struck his treble yesterday in Liverpool's 4-1 mini-derby win.
He told liverpoolfc.com: "This is really important for me, especially because of how it's been going for me recently.
"Sometimes I've been playing, sometimes I've been not, injuries. I just had to keep my head high, I didn't want to sulk or anything.
"This was my career at the end of the day, so I had to decide whether I step up to the plate or not.
"Especially against Everton and in the Merseyside derby, it's a proud moment for me. But I wouldn't have been able to do it without the boys, honestly.
"I had to work hard on my own but this was all them. I had Kaide (Gordon) and Trent (Kone-Doherty) and all the balls they gave me, so I'll say thank you to them.
"This (the match ball) was for all of us."
Liverpool U21 coach Rob Page also said: "He (Figueroa) has thoroughly deserved his opportunity to play. He's been a credit.
"He's seen other players play and he's never grumbled once – well, maybe once or twice he's knocked on my door! But I respect him for that, I love him even more for that. What a guy and what a great character."