Step by step: select parts that match your simulation's components and put them in to KiCad's schematic editor. LTspice deals with idealized passives and models; for prototyping you need to pick real components that are linked to a BOM and a footprint, which LTspice knows nothing about.
Edit to add: if you want to try new and bleeding edge, there are tools like
https://www.flux.ai that aim to integrate simulation, ECAD, MCAD, and firmware development. It's being developed by a friend of a friend of mine. Current tools don't lend themselves to turning a simulation into a schematic without basically redrawing it; some EDA packages have internal SPICE engines, but seemingly nobody uses them.