If you're just looking for a laundry list of note-taking apps, I'm sure Google can help. If you want real advice you need to provide more information. You're obviously in the habit of taking notes with pen and paper, so why have you failed miserably to keep a digital journal? What part of it doesn't work for you? Your list of requirements is missing that bit of information. You want a "single file or cloud app where I can organize personal notes on projects, configurations, insights, ideas, etc.,". Well, that about covers every single note-taking app ever written, as well as every text editor from the dawn of time. Try to narrow it down a little. Or, stick with pen and paper if it's been working for you. What do you hope to gain by going digital? Knowing that will help point you in the right direction.