what are some cheap/lazy pc lifehacks which improved your pc ux? something like a long headphone cables or specific shortcots

If you haven't already, Powertoys is a pretty useful tool. Some of the utilities I use a lot are Powertoys run, image resizer, color picker, and occasionally PowerRename. Paste as plain text and Text extractor are relatively new additions I probably would use more going forward.
And although it now also has Peek to preview files for the file explorer, I still prefer to use Quicklook for that.