I'll link a few recent threads that may be useful :>
The main disclaimer about advertising your comic externally is that while it's possible to increase your views quite a bit, getting people to interact (sub/like/comment) is difficult. Someone who follows a link from reddit, for example, probably doesn't have a Tapas account and can't do any of those things. And it's always the case that not everyone who reads will want to sub even if they do have an account. BUT it's still worth putting your work out there, because the more people see it the more chances you get to build readership! ^^
A note on your format: don't worry too much about being story driven! Some of those types of comics aren't as popular as single strip comics, but they still have the potential to grow an audience! One thing I would recommend though is to try out a few different update schedules to see what works best for you/your growth. You may find that posting 1 page a week rather than 4 every 4 weeks nets you more views subs, or maybe the middle ground: 2 pages every 2 weeks? Diff. schedules work better/worse for diff comics, just requires some experimentation on your end.
Best of luck