It feels underwhelming but also sweet, a bit on the bittersweet side it ends just like that; but I kinda see it aligns with how the Haniel plot resolved -- life will just go on as normal as it is.
She's now a celebrity with an extent of success being featured on a subway billboard like that, but not a nation-crazed stars or anything of that caliber judging from the fact they can still live a normal life there at Gojo's old house just like that. He also find success in his field and his dream.
Well, that's life. MC doesn't have to always be the 0.1% of the people who was so successful to the very top of the top level. Not everyone can be that person. This level of success, though it's already difficult, is something a lot more attainable and realistic (and probably the sweet spot before the negatives ramp up even.) It's bittersweet, but sweet nonetheless.
Still hope for a little more epilogue to tie up the loose ends though.
Also something like her getting interviewed and it was brought up as trivia that she's actually the 'Princess' behind Haniel cosplay and her husband, a well-known hina doll maker, is actually the person behind the costume -- and that's what led up to them dating; the story got viral for a day or two, and everything goes back to normal.
Hope I get to see that; but whether or not, that will be my head canon now.