Is acoustic foam enough to fix my room?

Thin foam fixes flutter echo and dresses a video background; it does not fix a room. The physics: 1–2" of open-cell foam absorbs upper-mids and highs (decently) but is nearly transparent below ~250Hz, where the actual problems — room modes, boomy bass — live. Those need 4-inch-plus mineral-wool panels and corner bass traps. Budget honestly: foam is a finishing touch, mass and thickness do the work.