Tbh there's nothing more to tell as a main story. I'm glad it's not one of these authors that unnecessarily stretches things out for the sake of it. You're getting it for free, but some people are paying you know.
Girl they could’ve at least included their honeymoon scene after their wedding and go straight to the side stories
That's extra elements up to the author, not necessary elements of the plot. Just because you would've wanted it doesn't mean they should. Those are two different concepts. The whole point was to know how they would end up together. We know. That's the whole plot.
And remember that side stories are also optional. The author doesn't owe you a side story. We could've also not gotten one.
It makes perfect sense for the story to end there from a narrative scheme point of view. Anything else is extra that we should be grateful for, not something we should demand. Just because you are used to getting such elements in Korean and Chinese webtoons doesn't mean the author should give you that.
Also know that elements like does in most reading formats are called "epilogues". The whole point of an epilogue is to be optional. Just like the honeymoon, just like the sides.
Not everything that satisfy you personally is mandatory.
WYM SIDE?! THE MAIN STORY ALREADY ENDED?! WTH GIRL GIVE US MORE???