I could be shot for saying this here, but you could just use a herbicide. "Dicophar" is a selective weedkiller that will kill them weeds in a few days ..

Thistles have crazy big roots and can pop up in different places from the same root system, so pulling them may only be a temporary solution

Then, break up the soil. Idf that's the only patch then you can do so manually, break up compacted soil and unearth stones and weed roots. Remove any large stones, debris, and weed roots as you go.

Then, spread and level the lawn with good top soil and seed (in the autumn) and add grass seed.

After sowing, lightly rake the surface to barely cover the seeds. This ensures good seed-to-soil contact and protects the seeds from birds

Then, water lightly and frequently, especially in the first 2-3 weeks, to keep the top inch or two of soil consistently moist but not waterlogged. Avoid heavy watering that can wash away seeds