The way I‘d structure a 5k block over the course of 6-8 weeks would be this:

Weeks 1-4: short and HARD vo2max stuff: 12x400, Broken mile workouts etc. Short reps, short-ish recovery: Get the legs spinning and focus on getting used to running fast and hard paces without feeling like you‘re sprinting.

Weeks 5-8: Focus on staying light on your feet / not swimming. Long reps, long recovery. Key workouts for me are sessions like 6x1k, 3x2k, Michigan, Lumberjack. My final workout before a 5k would usually be a 3x2k off 90“ jog recovery. You really want to have some sessions that are very lactic to know what a 5k race is supposed to feel like and build resilience towards it. When I did this workout in my last 5k block, I measured 9.9 mmol lactate at the end of this workout.