Later years and international career

After leaving Cumbayá, Quintero moved to Ibarra and later went on a trial at Mushuc Runa, who wanted to sign him, but couldn't register him.

Quintero continued to study in Ibarra and ended up joining Imbabura SC, also in Ibarra, at the age of 17 in 2017.^[3] Quintero suddenly got the opportunity to show himself of to the U-20 national team. After getting his debut for the U-20 national team in November 2018, he was also summoned to the 2019 South American U-20 Championship-playing squad, who ended up winning the tournament. In May–June 2019, he was also a part of the bronze-winning U-20 national team in the 2019 FIFA U-20 World Cup.^[3]

He ended up staying at Imbabura until the end of 2019.

Loan to Olmedo

To gain some more minutes, after playing only 273 minutes in the 2020 season and sitting on the bench without coming on in the first four out of five games of the 2021 season, Quintero was loaned out to fellow league club C.D. Olmedo on 25 March 2021 for the rest of the year.^[6]

On 1 November 2021 Olmedo confirmed, that Quintero had been fired by the club and sent back to Barcelona.^[7] Through a statement, the club explained that the decision was made after a series of events, actions and versions issued by the player: We will not tolerate disrespect for the history of this noble institution, its fans, its coaching staff and players, the statement said.^[7] The reason behind Quintero's exclusion stemmed from some statements that he had published in a live broadcast on his social media, where he - among other things - pointed out how little interest he had in the team, following a 5-0 defeat on October 31 against Independiente del Valle, which resulted in Olmedo being relegated to the Ecuadorian Serie B for the 2022 season.

Return to Barcelona

After the controversial departure from Olmedo, Quintero returned to Barcelona SC. However, in February 2022, it was reported, that he wasn't a part of the squad, even though he was still under contract.^[8]