Now is a good time to learn English.

Many people in around the world are learning the a second language except in addition to their native language. I think the reason is that many people can now go to other countries easily and we can easily it is easier to learn about foreign cultures. A few years ago, we rarely saw the foreigners surprisingly. But now, we can see foreigners everywhere. That's because For this reason we learned a lot about foreign cultures a lot. So I think it can be a motivation to learn a foreign language, including English.

Now is a good time to learn English.

Many people in the world (which people are not 'in the world'? Astronauts?) are learning/studying the a second language (the following phrase 'except ...' is redundant) except native language. I think the reason is that many with a second language people can easily go to other countries easily (put the adverb nearer its verb) and we can easily learn about foreign cultures. Few Not many years ago, we were surprised whenever we saw the foreigners surprisingly , but nowadays, we can see foreigners everywhere. That's because we have learned a lot about foreign cultures a lot. So I think it (what does the pronoun 'it' refer to? 2 reasons? then it would be plural) those reasons are can be a motive give us incentives/motives to learn a foreign language - including English.

Now is a good time to learn English.

Many people in the world are learning a second language other than their native language. I think the reason is that many people can go to other countries easily and we can easily learn about foreign cultures. A few years ago, we rarely saw foreigners. But now, we can see foreigners everywhere. That's because we learned about foreign cultures a lot. So I think it can be a motive to learn a foreign language including English.