Not About Fatigue
Burnout in IT is not about fatigue. It's about losing meaning and growth. Very often people think, I work a lot, that's why I'm burning out. In practice, this is not the case. I rarely experienced burnout, and each time it was not due to the number of tasks. The main reason is the lack of growth. You do the same tasks, understand the system, fix bugs. And at some point, you catch yourself thinking there's nowhere further to go. Interest starts to decline, the team irritates you, the process annoys you. You're in the same context for 40 hours a week, if it doesn't change, you burn out. My solution was simple, I changed the environment. New company, new tasks, new people, new level of complexity. If I had stayed at my first job and continued to write the same thing, I wouldn't have grown. Sometimes, to grow, you need to change places.

Two other reasons
The second reason is the lack of influence. You see problems in the system, understand how to solve them, but you are not allowed to do so. I had such a case, a person who restricted all changes. I saw that the system was suffering, but I couldn't do anything. One of the most difficult periods. When the situation changed, I reworked the system in a short time, improved performance, and increased conversion. The feeling when you truly influence the result is the best antidote to burnout.
The third reason. Overload: too many tasks, no control over workload, constant context-switching. Workload is a manageable thing. You must be able to evaluate tasks, allocate time for quality, and say "we won't make it." Taking on everything is not heroism. It's a path to burnout.
What helps
Another common problem is trying to learn everything at once: a new language, a new framework, a new article, a new course. As a result, there is no depth, no system, and a constant feeling of falling behind. Growth is not about "knowing everything." Growth is about moving strategically. What really helps: limit your workload and don't take on more than you can handle; don't spread yourself too thin, choose a direction and delve deeper; build a growth strategy; take breaks. Even simply going out for a walk can have a significant impact. Burnout is not a weakness. It is a signal that you are not growing, are overloaded, or are not making an impact. And it is resolved not by motivation, but by changing the conditions.