While there's sure to be more Halo in the future, there's been no official communication as yet regarding a seventh "mainline" Master Chief game nor any prospective competitively-focused replacement.

TL;DR: Halo Infinite will retire from official Halo Championship Series esports after the 2024 World Championship, signaling a shift toward a new Halo game expected in 2026.

A very blatant teaser heralds Halo coming to PS5 via a crossover, but a proper game is rumoured to be launching soon too.