As others have said, you can't control or predict how readers will interact with your content. It is however, not based on pure luck.
The point I would like to make is that if you cannot control the reader, then it is futile to dwell on this. Allowing the reader numbers to determine your worth leads to unhappiness.
What boosts confidence is to focus completely on what is 100% in your control: your content. Your story. And how widely you Share it.
The thing about the Internet and our life as independant creators is that we have an extremely low bar of entry. There are no longer gatekeepers that serve as a funnel for content. Instead we have the entirety of the readership market, and they are brutal.
The market is democratic, and it will decide if your content is good enough to flourish. The thing is in the web comic game, if you want any kind of ongoing success you must keep your work and learning ongoing. It requires a 3-5 year dedication before you even consider giving up. Because if you do all the right things, the right actions of posting regularly, sharing on Social (I have more to say on this subject for my fellow introverts), and keep learning your craft and improving it AND you still don't see success in the form of readership. Then you know the market has decided that your work is not good enough.
3-5 years can feel like a long time. But life is a long thing, and if you take care of yourself you can and will live a long time. There is time enough to put in your all and if it doesn't work, you can switch directions no worse for wear and if anything with many good work habits. You never really lose all you've learnt just cause a project has failed.
On the topic of promoting on Social. I think it is not helpful to rely solely on Tapas. If you're seeking a career or even just hobby success in comics, the you are 100% responsible for your comic.
Learning how to draw and write, creating it, responding to any and ALL comments cause those are human beings who have taken time to comment (!), and placing the comic where people can find it. I.e marketing or promoting.
Now I'm not a fan of DMing or spamming people's pages. But I have an action plan. People love to see WiPs. They love to see HOW the comic is made.
I think the mindset that helps is not that you're promoting but you're offering something of entertainment value to the receiver. It's not about what you can GET but what you can GIVE to the Reader. If you are not actively sharing your work on every single Free platform there is...then I do not see how you can expect growth. Fretting about things not in your control like readers or organic reach will not help.
I think as long as you stay honest to yourself about the kind of story YOU want to tell and you just work on doing it well and sharing it, that will help you grow.
This is not a lazy creator's game. The world owes us nothing and will offer nothing until we do something first. It will be difficult but everything worth doing that has great rewards requires great effort and nothing less. Gimmicks and tricks might work in the short term but not in the long run.
All just my opinion here.