ㅇㅋ I don’t know how lazy you are BUT it also might be cause of the parts you’re drawing in your current chap.
For example;
I hate drawing backgrounds.
Whenever I need to draw a detailed background, I get cold feet drawing the whole novel. (Mine is a Lightnovel turning into a comic rn)
Maybe you’re working on a part you’re not that excited about? (Like me?)
Or maybe your chapters are too long (again, idk but) ?
Maybe you think you’re slow but you’ve actually done a lot?
And if these are not it, I’m sorry hahhah
Anyways, you mentioned that you wanted to publish your comic weekly. If you think you’re slow, the best advice I can give you is;
Be patient before hitting your first publish button and save up couple of ready-to-go chapters ^^
This will help you A LOT, so you can have extra 4-5 weeks (depending on how many chaps you saved up) for the next chapters
Have a nice dayy!!! ^^