Totally agree.
In the modern day, where everything is abundant and accessible, there is much more to the success of a series, that extends further than the series itself as well. (I'm not an artist, so I can't comment on the art itself. However, I do study business, so I can help a bit there. )
1) Uniqueness and relatability, you mention this in your example of
Really, its the quality and defining trait of your work, which I am in no position to comment about, since I'm a beginner when it comes to comic creation.
2) Execution and timing, cause sometimes, waiting for the right time to release the right quality of work is crucial in the success of something. For example, A author will be have a higher chance of being successful if they create a spin off series of Sherlock Holmes, but seen through the eyes of the main villain as he pulls the strings behind the scene for altruistic goals, at the peak of the craze for "the misunderstood villain" type characters. (This can also be applied through "hyping"/leading the audience with a outstanding trailer or teaser of your work, such as all the posters for Avengers endgame.)
3) Interaction with the community. This helps spread your name, and if people take interest in what you're doing in the community, they'll be more likely to try out your work. However, this shouldn't be your main goal in helping out the community. This is a side effect, and honestly, faking this takes a lot of time and effort, which you'll easily get burned out on if you don't have a genuine desire to participate. The best way you can tell fakes from the real deal is the consistency of their character afterall.
4) Connections are everything, and to maintain connections, you need to be transparent. This probably the most basic principle of business and is kinda self-explanatory. Essentially, just be a good person and don't fake or oversell yourself. Try to give a good and objective evaluation of your strengths, weaknesses, and skills, and check your attitude. People are a lot more perceptive than you might think. Just look at all the dumpster fires on twitter, exposing people for who they really are, to get an example of the positive effects of connections, and the negative side effects of not maintaining them. But besides that, taking a risk and creating a link here or there won't hurt you at all, and the risk-reward ratio is definitely worth the risk.
Disclaimer: There are alot of different practices and innovative business models out there, which all get into the weeds with different philosophies, specifics, and data of "a successful business". However, what I stated above are basic principles that you will learn early on.
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