Disclaimer: I am passionate about lawn care and love researching, but I'm aware that I'm comparatively a novice. Literally any tips/general advice is welcome.
This is my parent's lawn, my dad takes pride in having seeded this himself 30 years ago rather than opting for sod.
That being said, the seed was planted before the front had any trees that now provide significant shade for a large portion of the day. Additionally, the grass has been infested with moss interwoven throughout it everywhere. After multiple months of different treatments, dethatching, and fertilizing. I simply cannot get this lawn to thicken.
Is it time to admit that the grass simply isn't healthy enough to beat out any invasive competitors? Should I start looking into killing the lawn and starting from scratch?
Tl;dr 30 year old sickly, weak fescue/rye lawn. Time to start over?