The days awere set aside for people to take a rest from their professional duties, by worshiping, meditateing, and staypending time with family members.

また、

The days were set aside for people to take a break from their jobs by worshiping, meditating, and spending time with their families.

Over time, starteding from the late 19th century, the labor movements struck, and pushed for a shorter work week, and which eventually led to athe two- days off once a week as we know it today.

It appears that in some developed countries, working individuals are seeking for a three-day weekend.

Therefore, I believe ifwhen the day arrive, commoners couldcomes, everyone will enjoy three days off consistenta week regularly, which wouldill likely lead to a significant boost in tourism.

「commoner」はあまり使われません。

These days are set aside for people to rest from their professional duties, worship, meditate, and stay with family members.

Over time, started fromStarting in the late 19th century, the labor movements struck, pushed for a shorter workweek, and eventually led to athe weekly two-days off once a week as we know it today.

'started from' is usually used to indicate location that you are leaving: (eg. 'We started from Los Angeles for our road trip'); 'start with' and 'start in' are more appropriate for this case. don't need an article (the) for labor movements because its unclear which labor movements you're talking about, but if you wanted to mention a specific labor movement that would be okay :).

It appears that in some developed countries, working individuals are aseeking for a three-day weekend.

'seeking for' is a little awkward/not used - seeking doesn't require a preposition in general (eg. 'she's seeking the truth,' 'they are seeking an answer,')

Therefore, I believe that, if the day arrives, commoners could enjoy three days off consistently, which. This would likely lead to a significant boost in tourism.

therefore is a little redundant here. more stylistic, but if you have 3 commas in your sentence, it's probably good to cut it off with a new sentence (I also make my sentences way too long as a native speaker :) but it's a good habit to get into)

The days are set aside for people to rest from their professional duties, so that they can spend this time to worship, meditate, and staybe with their family members.

Over time, started fromThen in the late 19th century, the labour movements struck, pushed for a shorter work-week, and eventually led to awhich resulted in having two- days off once aevery week, as we know it today.

Therefore, I believe if the day arrives, commoneritizens could enjoy three days off consistently, which would likely lead to a significant boost in tourism.