The "dream job" is no work at all. If you're working a 9-5 because you need the money, try and reduce your hours from 40 as much as you can. Start delegating work to AI or outsourcing it. Have your camera off during meetings and your attention elsewhere. Do the bare minimum, most of the time people aren't reading your slides or whatever work you're doing. You shouldn't feel bad. Working 8 hours also doesn't guarantee productivity. It's a trap that keeps you occupied and demoralizes you.