If you have ‘Sunday night dread’ you are definitely not passionate about your work. If you wake up on Monday morning tired of going to work, it’s clear that you’re stuck with your job. If you work disinterestedly in a job because your monthly salary will be cut off and you will be left without money for the essential expenses of your family if you suddenly change to another field, you will not grow in that job.
It is normal to feel tired when doing a task over and over again. This burnout is likely to be exacerbated by working for years in a less qualified and less skilled job. People with such symptoms may seem to quit their current job and move to another job. Or they think that they can earn money by doing other part-time jobs while still working. 
If we don’t rely on only one field and develop skills in another field, we may think that one of the two fields will protect us. But it is important to use time properly to develop sectoral knowledge in two different fields simultaneously. Workers in almost all fields have this problem. Many people are working in various fields thinking that we are sticking to this work for livelihood, forgetting the ambition with which we joined this work.
We have heard many successful people say that it is better to work tirelessly on the first goal because the second goal dilutes the first goal. On the contrary, people who cannot earn much money in life say that second ambition is necessary. It relates to their path, their success and failure, their luck, and the people they met. 
But the secondary goal may require more time to reach beyond the age of 30 or 40. So time management, hard work and perseverance are all necessary for this. If you follow this correctly for a few years, you can accumulate more success in your second goal than in your first goal.