Despite this success, The Rengifo family parted ways with Jorge Tupinambá dos Santos and hired Argentinian Juan Quarterone whose new tactics, player recruitment and training methods helped the team win the Segunda División de Fútbol Salvadoreño in 1974 and earn promotion to the Salvadoran Primera División for the first time in the club history.

Platense along with domestic success, became the first Salvadoran team to win the Torneo Fraternidad / UNCAF Club Championship in 1975 thanks to players such as Albert Fay, Jaime Castro, Helio Rodríguez, "Ninón" Osorio, Pedro Silva, Jorge "el Indio" Vásquez, José Luis Rugamas, David Pinho, Luis Condomi, Ricardo Zafanella, Jorge Búcaro and Rafael "Ráfaga" Búcaro.

It would take another 13 years before the club will be promoted back into second division thanks to future internationals Luis Anaya and former World cup player as coach Mauricio Alfaro.

Following increased support by the community and stronger financial backing by local businesses, Platense began a resurgence in the second division.

The club recruited first team coach Jorge Abrego and key players such as Herberth Ramos, Wilber Arizala.

Despite the disappointment of being denied promotion, the departures of key players such as the league and club top scorer Colombian Cristian Gil Hurtado, Keeper Herberth Ramos, and the sacking of Jorge Abrego as coach.

The club overcame this by hiring experienced coach Guillermo Rivera and players such as Rafael Burgos, Colombian Juan Camilo Delgado and .

After a season of consolidation, It appeared that Platense would win three straight titles in a row, they reached the final and were leading 3–0.

On 20 June 2021, after 41 years out of the Primera Division, Platense were promoted back to the top flight following a 2–1 playoff victory against regular title contenders AD Destroyer 2–1 with goals coming from Steve Alfaro and Camilo Delgado.

The stadium "Estadio Antonio Toledo Valle", which previously belonged to the National Institute of Sports (INDES), now are being cared for by the municipality.

Note: Flags indicate national team as defined under FIFA eligibility rules; some limited exceptions apply.

Note: Flags indicate national team as defined under FIFA eligibility rules; some limited exceptions apply.

Note: Flags indicate national team as defined under FIFA eligibility rules; some limited exceptions apply.