The lives of galaxies are governed by the baryon cycle, which involves the accretion of gas, its consumption via star formation, and its ejection or heating through feedback from stars and active galactic nuclei (AGN). In massive galaxies, the crucial impact of AGN feedback for regulating star formation has been supported by a wealth of observational and theoretical studies. In this talk, I will highlight results from two distinct surveys, studying AGN with diverse outflow strengths, at different redshifts and at different evolutionary stages. Firstly, I will present results from the JWST Early Release Science Program Q3D studying three luminous quasars with large-scale outflows at different redshifts (z~0.4, 1.6, 3). Specifically, the targets are undergoing the rare and intense extremely red quasar phase, believed to represent an early “blow-out” stage: After a quasar is fed large amounts of gas funnelling to the centre (entraining dust), it launches violent outflows that will rapidly clear out the central dust. I will share new insights into the geometry, mass loading and kinematics of the winds, accretion, as well as localised physical conditions. I will also present a cross-comparison of virial black hole masses derived via multi-wavelength tracers, and discuss implications for the increasing number of studies on black hole growth at high redshift in the JWST era. On the low-redshift side, I will introduce a sample of AGN with low-velocity ionised outflows and suppressed star formation, and present a first look into their molecular gas distribution via new NOEMA (Northern Extended Millimeter Array) follow-up observations. These sources are suspected to be at a late evolutionary stage and potentially undergoing one of the final phases of AGN feedback before quenching.