Overcrowded grass after overseeding

What people tried

Every workaround mentioned in the threads below. We haven’t tested any of them — and nobody here is claiming they worked.

1. 1
   Using a dethatcher on a light setting to thin it out
2. 2
   Leaving it alone and letting the grass naturally thin itself out
3. 3
   Reseeding any patches that die off from competition later
4. 4
   Mowing the grass more frequently to manage the thickness
5. 5
   Lowering the mower blade height
6. 6
   Doing a light dethatch to thin out the undergrowth
7. 7
   Letting natural competition thin the grass out over time

In their words

Unedited, grouped by where they were said, most upvoted first within each place, each linked to the thread it came from.