What’s your subsoil? We have clay underneath so spread 20T manure across the area and rotavated it in to the clay and then compacted and spread about 100mm of topsoil using a digger and the raked it level-ish, light compaction with a water filled roller, then raked the top, added a new seed fertiliser and then seeded with our seeds of choice.
I had a long chat with ChatGPT about seeds specific for our requirements and ended up with a large variety of different seeds. About 1/3 rye grass for quick establishment, 1/3 tall fescue which does well in clay and dry conditions due to long/deep roots and the final 1/3 a mixture of other fescues and a small amount of bent grass.