First of all, time management techniques for neurotypical people do NOT work for people with ADHD.

This is why an diagnosis is so important. If you don't know that you have ADHD you will constantly try stuff that won't work for you, you will set up yourself for failure and do more harm that good and it will destroy your self esteem.

Neurotypical people tend to be importance motivated while ADHD people are interest motivated. So the approach needs to be very different. Furthermore time is very different for ADHD people. Most neurotypical people can not cram in the work of 8 hours in 2 hours, I can. But I also can't hyper focus all the time and have times where I am not getting anything done.

With ADHD it is more about managing your level of stimulation. You start the day in a dopamine deficit and need to start with small tasks that gives you quick wins. You can't tackle the important but absolutely boring work head on, you need to do some stimulating activities first to get the ball rolling.

Many ADHD people including myself develop a special interest in ADHD and organizational techniques to manage it so yeah it happens. But you can't fully control what you happen to be interested in.

Though the whole self optimizing thing is also dangerous. Some people can learn to mask their ADHD very well and be super organized but it comes at a cost. It takes tremendous energy and leads to ADHD burnout in the long term. That is often the trigger for adults to get diagnosed in the first place because they just can't keep up the masking anymore.