"What is the appropriate way of rejecting a shidduch? If you know they won’t “get” your answer based on something you feel strongly about but it’s more personal and you also dont want them to think your picky…."
​https://www.theyeshivaworld.com/coffeeroom/topic/saying-no

"Now of course you will tell me “when I tell the shadchan that “it’s not for me” they try to convince me that it is! It’s better just not to call them back! I have two comments"
https://www.theyeshivaworld.com/coffeeroom/topic/wannabe-shadchan-sounds-off

"In reality, sometimes it makes sense and sometimes it does not make sense for Jews of different cultures to date each other because it might be difficult to reconcile their cultural differences. So the real question is how to know when cross-cultural dating is a good idea, and how to deal with the practicalities of accepting and reconciling two people's different backgrounds, customs, expectations, or even worldviews."
Link:
https://www.aish.com/d/a/48939872.html

"I know several “mixed” families who seem very happy and content. Its probably dependant upon a lot of variables, though."
Link:
https://www.theyeshivaworld.com/coffeeroom/topic/ashkenazim-would-u-date-a-sefardic

"What happens when you match a Sephardi with an Ashkenazi? “Ashkesfard” couples share their stories about the culture shocks, halachic adjustments, and other unexpected surprises"
Link:
https://mishpacha.com/mix-match-ashkesfard-version/