2. Why did Wakanda go into isolation?

Wakanda is home to a lot of Vibranium, one of the strongest metals in the Marvel Universe. To keep it out of the wrong hands, the ancestors isolated themselves. This idea is reinforced in Black Panther's mind when Ulysses Klaw breaks into Wakanda, kills his people, and steals Vibranium to sell to arms dealers.

Explanation:

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Wakanda is home to a lot of Vibranium, one of the strongest metals in the Marvel Universe. To keep it out of the wrong hands, the ancestors isolated themselves. ... If it's advanced technology were to be put into the wrong hands, like the ancestors were worried about, it would be devastating

it's a secular holiday. it is and was a custom developed to recognize the ending of a time and a wish for a good future. the kind of kiss you exchange, if you are single, is intended to predict what kind of year you will have in the coming year.

it is saying good bye to the last year with all its ups and downs, and hello to the new year, with all its hopes and dreams.