You don't mention if you are tracking food, which seems to be a major metric to miss out. I simply track approx carbs, which I find insanely easy.
Lastly other cheap metrics you could track are body fat (callipers cost next to nothing) which is easy to measure ESP with a friend helping, you can also track maximum widths. So what it the biggest part of you arm, leg, stomach, chest, neck, etc. just tracking weight is misleading as you could be dropping fat and gaining small amounts of muscle from your increased mobility.
Personally, I do slowcarbs (like low carbs but with pulses and beans) while weighing myself daily and taking body size and body fat measurements once a week. I've lost 15kg like this and dropped from 19 to 12% bodyfat. To get that drop I did no additional exercise, though now I cycle daily.