Nice to know from you that content creation is a great experience for you. I also like to create the quality blogs but while writing I have to be very focused towards my topic because quality blogs information that should be confined to your topic and irrelevant information if you are providing then your blog will be not a quality blog so it's very important to be focus the first and it needs your mental attention.
Obviously when we are working a lot at everyday and when we are not getting the reward of this in the form of votes in the form of comments or appreciation of other people then we may be discuss and disappointed and it also lowers our morals. This is a valid reason that you give regarding the mental exhaustion.
But it is our duty to keep ourselves motivated and to keep ourselves away from the mental exhaustion because when we are mentally exhausted then we cannot perform anything in fact we cannot do our daily life tasks.