2Maenavia - recently I’ve finished “The Talos principle II” and it’s a quite nice example of UE5-based game, with tons of foliage and it’s still runs fast enough with DLSS set to “quality” (monitor resolution is 1920x1080) on maxed out graphics, so I’ve got 50-60fps for my mobile RTX 3070 (desktop equivalent is ~RTX 2080 I guess). And it’s clearly Lumen lighting - spotty & moving GI artifacts at 50+ m distance are there, reflections also Lumen (clearly visible switching between screen-space and Lumen cache on water). Maybe worth checking out how they did that (there was a video on youtube from developers, as far as I can remember), at least if those numbers looks desirable for your project.
MOAR screenshots if needed.