Not as a creator myself, but I make a good income by drawing for other people's webcomics, be it as lead / promo art / concept artist / patreon exclusive artist or assistant.
Then webcomic making isn't for you, if you want to live solely of what you do or create, then... What do you have that is worth spending time looking at, paying for? Sadly when you want to make a living out of something you gotta think more like a business.
Is the quality of the art good, does it attract people? Is the quality of the story or writing good enough to keep them hooked and interested? Do you have a steady posting schedule with consistent quality of previous aspects to creeate loyalty and long term interest? Do you have a loyal fanbase that will not only read what you make but will be willing to support you financially with the smallest donation or higher numbers? From all the artists, writers, independent authors or by editorial that are out there making new content daily, why would someone pick you? That's some of the things you need to think about before trying to bet everything in a comic.
If you want to make a comic because you want to, then those aspects shouldn't matter as much, time is going to be wasted one way or another and you'll only care if you put a goal that has more chances of not being fullfilled.
