Something I must do before the year ends.

1. First of all, before end of the year,I want to spend more time with my family.

>> First of all, before the end of the year,I want to spend more time with my family.

2. exactly, Having dinner on 31st, Dec.
 >> To be exact, I want to have dinner with them on the 31st of December.

3. And I want to make the \'Bucket List\' for 2020.
 >> CORRECT

OR >> And I want to make my \'Bucket List\' for 2020.

4. Also, I have to meet my old friends and go on a trip with them.
 >> CORRECT

OR >>> Moreover, I have to meet my old friends and go on a trip with them.

5. One more thing, I should read some books that I bought this year.
 >> CORRECT

OR>> One thing more, I should read some books that I bought this year.

6. Most important of all, keep doing my best in my work and Having a Happy Christmas!

>> The most important of all, I will keep doing my best at work and I will have a happy Christmas!

I hope you have a Merry Christmas with your family, too! ^^

Good sentences.

- T. Melody ^^