What is better?

I wonder what is better: to have a very good command of one language or only a good command of several languages? I am fluent in Russian and my English is on an intermediate level[1]. I spent my last holidays in Spain and I consider Spanish as beautiful language. I think that it would[2] be fine to learn it, but at the same time I suppose that learning many languages simultaneously can be too hard. I do not know[3] what choose: to improve English and lost neglect Spanish, or to learn both of them.

[1] "I am fluent in Russia and my English is intermediate" would sound more natural

[2] "It would" is correct but I think nearly any native would say "it'd". "It would" is a bit too formal, except in work/studies.

[3] Similar to above, 'I don't know' would be much more common. 

Hello! 

How is it going? What's the weather like? It's a bit snowy and gloomy here and gloomy. The streets are so slippery because temperatures range from just above zero to minus zero.
I came home an hour ago- utterly exhausted and [1]ravenously hungry.
I ate yesterday's bean soup and some pasta.
I did a lot of typing at work today and my eyes are aching.
In spite my daughter, despite being ill, is ill ( she has a runny nose and a sore through throat but, thank goodness, she has no fever) she went to the kindergarten to take part in a Christmas event where she performed as a snowflake. Unfortunately, I couldn't go.
My day at work went well.
At four on Friday at four my daughter and I go to the a children's event devoted to Christmas. It will be held in the Jesus Savior Church which is situated in the central Moscow.
On Sunday I will go to a restaurant to celebrate the New Year with my colleagues. I bought a blue cocktail dress for [2]this occasion.
My ex hasn't visited our daughter for more than three weeks. Thank goodness, she doesn't miss him and even she she doesn't even doesn't remember him during the day.
I must go food shopping now
Take care
Merry Christmas and a Happy New Year

[1] This isn't incorrect, but you don't really need 'ravenously hungry', just 'ravenous'. I don't think anyone would say 'ravenously hungry', but 'very/extremely' hungry OR 'ravenous'.

[2] This isn't incorrect either, but a native would say 'the' rather than 'this'.

Very good!

MERRY CHRISTMAS

Hi everybody. Today It's December the twenty fourth, and at midnight tonight the Father Christmas will arrive get down at this time there, then and usually if you have been kind[1] all year, you should get a Christmas present. At least, I hope so.

I wish everybody a Merry Christmas.

Thanks a lot for correcting my mistakes.
Didier

[1] This is correct, but the phrase is 'nice'.

Organizing

Last night after getting back[1] home, I decided to tidy up my bedroom. It was really cluttered and I can't couldn't even find my things in that mess. My mom often gets angry with me because of that because she always picks up after me.

I started by separating unuseful useless things to throw away, such as old bills, canceled cards, letters and so on. Then, I straightened up my bookshelf and separated some books to donate to a nearby public library. I still have got some materials that I used in high school and I know they won't be useful to me anymore.

I felt better after cleaning up my bedroom :).

[1] The 'back' is optional. You don't need it, but it makes sense.

Well done!