looking at your comic, you need to make your text bigger. thats usually the issue when a comic looks fine on computer and not on mobile, i have the same problem. when youre sketching and lettering, zoom out until your image is phone sized to see how it looks.
thats how webcomics be! webcomic time is mental, it can take you a month to get through just a day of action. most people working on webcomics are doing it in their spare time and solo, so shit takes a while
some people post entire scenes in a go - but A: theyre usually short scenes B: theyre usually part of a team and C: theyre usually not updating weekly (read usually. sometimes B cancels out C, i know some comics that are made in a team that post like two scenes in a weekly update)
personally, the bitesize updates have grown on me. the comics i read that update in whole scenes take a little longer for me to get to reading, because i know theyre gonna take a little more time, a little more effort. in terms of actually absorbing the story i think the bitesize updates are detrimental, but in terms of picking up and retaining an audience, small and often is the way to go.