In recent matches, Fluminense has shown good defensive capabilities but has struggled to create clear goal-scoring opportunities. The team has primarily utilized a 4-2-3-1 formation, which, while providing solidity in midfield, limits offensive flow and creativity in plays. With players like Soteldo and Cano, it's crucial to explore the flanks more and promote greater movement among the forwards.

One main suggestion would be to adopt a 4-3-3 formation, which could provide greater fluidity in offensive transitions. This formation would allow the midfield to become more dynamic, enabling Fluminense to control possession and create more chances. The midfielders could alternate in their roles of protecting the defense and supporting the attack, giving more freedom for the wingers to cut inside and shoot.

Additionally, Fluminense could benefit from greater involvement of the full-backs in the attack. Players like Marcelo, who have excellent crossing ability, could be more encouraged to advance up the pitch, creating overloads on the flanks and more passing options for the forwards.

Another crucial point to consider is the intensity in pressing after losing the ball. The Tricolor should adopt a more aggressive mindset, seeking to regain possession quickly and forcing the opponent into mistakes. This would not only help keep the team in the opponent's half but also wear down opposing defenses, creating more space for the attackers to operate.

In summary, Fluminense has a solid foundation, but with some tactical modifications, they can significantly enhance their performance and increase their chances of success in upcoming matches. Adjustments in formation, greater involvement of the full-backs, and more intense pressing could be the keys for the Tricolor to maintain its pursuit of victories and stay firm in the G4.