How did I get here? "Why am I here?" sounds better.

I wanted to find a new way to practice my English daily every day ("daily" is correct, but this sounds better) so that's why I have started to surf on this site and have tried to look for a good place to speak and exchange interact with English native speakers.
Speaking English will be a real opportunity boost for my career. In fact, more and more jobs require to that you write and speak correctly in English. (I suggest: "You need to speak and write English for more and more jobs.") This That is the first reason why that I came here. The second one is because I love travelling. I spend a lot of time all over the world and I will appreciate to speak more and more with will love speaking with more and more foreigners people. (Use "foreigners" instead of "foreign people". "foreigners" is used less and less in polite English, it sounds slightly racist. I suggest "people abroad" or "people in other countries".)
I would love to share time between practicing it and help you to practice your French. (Your meaning is clear here but it sounds a little awkward in English. I suggest: "I would love to practice it while helping you to practice your French.")
Hope to speak with you soon.
Best.

"Best" on its own isn't how anglophones would end a letter. They would probably use their name, like this:

All the best,

    Julia

How did I get here?

I wanted to find a new way to pratice my English daily that's why I have started to surf on this site and have tried to look for a good place to speak and exchange with English native speakers.
Speaking English will be a real opportunity for my career. In fact, more and more jobs require employees to write and speak correctly in English. This is the first reason why I came here. The second one is because I love travelling. I spend a lot of time all over the world and I would appreciate speaking more and more with foreign people.
I would love to share time between practicing it and helping you to practice your French.
Hope to speak with you soon.
Best.

Good work Julia! :)