I do think sometimes folks just fail to see their own homes condition any more, they get so used to it, but try to then sell the house for more than it’s worth.
The minimal you should do is make the beds properly, Inc picking up the cushions rammed down the sides, move all the messy stuff away out of sight, Inc cleaning stuff in thr loos etc and at least tidy the junk outside,, and if the decking and stone work is filthy and slimy give it a quick power wash, power washers can be picked up quite cheaply. Just try to make it look nice.
This could be a lovely family home, but the messy dated upstairs, and the dirty outside space with random junk, will simply stop folks viewing and likely prevent the op getting the money she wants. These things are minimal effort really to achieve a result.