Of course you’re going to get tired.
The real question is how long does it take for you to recover?
If you need a month to decompress and re-energize before you book the next writing session, it’s going to be tough to write for a living.
If it’s going to take a year to recover after the exhaustion of putting out an album it’s probably best not to try to do this as a profession.
If you need two minutes to mentally rest and prepare before you can perform the next song, a touring career is probably out of the question.