Today, it was National Foundation Day.

I didn't nodo anything but strolling around my apartment, though there were a lot of things to do such as reading books or expanding English vocabulary.

I don'haven’t spendt enough time learning English lately so that it takes more time to make sentences.

These symptoms might have been caused by the omicron variant, but I'm not sure since I hadn't seen a doctor.

According to my source, February 11th was New Year's Day of the old calendar.

This national holiday had beenwas celebrated on a large scale before WWII because the government used it to raise nationalism.

Today, it was National Foundation Day in Japan.

I didn't nothing but strollingdo anything except walk around my apartment, though there were a lot of things to doI could have done, such as reading books or expanding my English vocabulary.

I don'thaven't been spending enough time learning English lately so that is why it takes moree a longer time to make/write sentences.

These symptoms might have been caused by the omicron variant, but I'm not sure since I hadven't seen a doctor.

Or "didn't see a doctor" depending on if you still have those symptoms or not.

By the way, the exact dayte of nNational fFoundation Day in Japan is ambiguous, ands the date was decided based on thean ancient myth.

According to my sourcean old calendar, February 11th wasused to be New Year's Day of old calendar.

This national holiday had beenused to be celebrated on a large scale before WWII becauseuntil WWII occurred which was when the government used ithis day to raise nationalism.

Apparently, there were political conflicts over the reestablishment of theis national holiday in the late 20th century.

Unlike many other countries, most people pay less attentionJapanese people don't pay any mind to National Foundation Day in Japan.

I wasn't sure if you meant most people around the world or most Japanese people don't pay attention/don't know about National Foundation Day in Japan.

Japanese people makes more sense to me because, for example, if you compare this day to America's Independence Day, most Americans pay attention and celebrate it by holding big parties.