Ronaldo starred for the reigning European champions in the Group B clash in Vilnius, taking his tally to 93 international goals.
The 34-year-old was happy for his team after the huge win lifted second-placed Portugal onto eight points.
"I'm having a good time, but the team was doing very well too," Ronaldo told reporters.
"I am happy and enjoying this moment, not because I scored the goals, but because of the level we have been able to demonstrate in recent years.
"It is up to me to continue helping the national team."
After back-to-back draws to start their campaign, Portugal recorded much-needed wins over Serbia and Lithuania.
— Portugal (@selecaoportugal) September 10, 2019
Ronaldo feels Portugal – in second spot and holding a game in hand – are closing in on a place at next year's showpiece tournament.
"The hardest thing was winning in Serbia, and it was important to continue with a triumph here," he said.
"We are closer, we have two games – one at home and one away – and I think if we win one of those matches it's enough."
Portugal host Luxembourg and visit group leaders Ukraine next month.
Photo: Twitter (@selecaoportugal) Caption: Portugal star Cristiano Ronaldo.