Additional context needed: which section is the target, and what must stay untouched.
"Bolder" is an amplification request, and almost always it is scoped to something that already exists. The surrounding page, its system, and its conventions are the given. Your job is to raise one part to the conviction the rest already implies, without rebuilding anything the brief did not name. The reflex answer, reaching for more effects, is the opposite of bold; reject it first.
"Everything else stays" is a literal instruction. Touch only the named target. Do not restyle its neighbors, do not migrate the page to a new idea, do not add colors, fonts, radii, shadows, or system primitives the surface does not already own. If the existing system genuinely cannot express the direction, stop and ask the user directly to clarify what you cannot infer. before expanding it, naming the exact addition and the job it would do.
A section usually reads flat for reasons its neighbors have already solved. Look at what the rest of the page does that this section does not: the display type at full strength, the structural devices that carry meaning, the signature motif, the density and pacing. A flat section is typically one that quietly opts out of the system's own strongest moves. The most reliable bolder pass brings the target up to the expressive level its neighbors already reach, in the system's own vocabulary rather than a new one.
Strip the copy out of your planned section and study the bare structure. Does the skeleton still say what this section is and why it matters, through hierarchy and the system's devices alone? If it only works once the words return, the boldness is in the text size, not the design. A placeholder for an image or artifact names a job, an anchor and a piece of evidence, not a cue to drop in a decorative photo; fill that job with whatever the subject actually has.
When the target holds its own without pulling the page apart, hand off to /impeccable polish for the final pass.