how can i improve my chess?

"... Suba makes one point abundantly clear in the beginning – [Dynamic Chess Strategy] is not for players who cannot be considered advanced, and by that he means not for children (unless they are prodigies) and not for players under 1900 Elo. An Internet poster noted that many lower-rated players 'fool themselves' into thinking they understand very advanced chess books because 'they read them like novels' without ever really grasping the main points. As Suba is such an entertaining writer – he has an incredible wit – there is a danger lower-rated players may fall into this trap here. ..."

https://web.archive.org/web/20140708233425/http://www.chesscafe.com/text/review775.pdf

Without going into great detail: Try developing another hobby or activity you can begin working on when you have your days where you're at the negative end of your polarity. Make it something challenging (like Chess, Math, your normal interests) but understand that because your main focus is Chess, you might not excel initially. Just do your best and mainly just let yourself drift into this activity and escape from the rest of the world when you spend time on it. Clear your mind of everything but it. 

This may help. And remember - the goal is to feel the best you can feel on a daily basis, with the most consistency. Whatever that ends up being. Your goal is *not* to excel the most at activities surrounding your core life like work, relationships, etc. So, your happiness is not dependent on results in your hobbies and side activities. Again, just focus on effort and always make sure that when you step away from a challenge, you can say you did your best. 

Balance is extremely hard to maintain for anyone. Sometimes, diversifying your mind even more helps you to feel more even and have less of the swing days. Putting too much "stock" in any one focus can sometimes be overwhelming in and of itself. 

Question, in the lessons of tactics, I usually do for chess time because it's free. But I have a doubt, I know the good thing is to hit the exercise as quickly as possible, but should I care more about getting the lesson right or over time, is that the tactical lesson?
I got to 1500 in tactics and I think I came back a lot for lack of practice, I work teaching math and I don't always have time! And also here in Brazil we are in economic crisis, there are 13 million unemployed, I see father and mother with unemployed children for months and even years !!! our president Jair Bolsonaro is doing a good term and is gradually getting better, there is a lot of fake news about Brazil and about our president who has a "negative" image mainly in Europe.

I read Suba's book when I was about 1425 USCF

"... Suba makes one point abundantly clear in the beginning – [Dynamic Chess Strategy] is not for players who cannot be considered advanced, and by that he means not for children (unless they are prodigies) and not for players under 1900 Elo. An Internet poster noted that many lower-rated players 'fool themselves' into thinking they understand very advanced chess books because 'they read them like novels' without ever really grasping the main points. As Suba is such an entertaining writer – he has an incredible wit – there is a danger lower-rated players may fall into this trap here. ..."

https://web.archive.org/web/20140708233425/http://www.chesscafe.com/text/review775.pdf

Always take your time, as long as it doesn't run out, you're fine.

And I still read it now 😅

Always take your time, as long as it doesn't run out, you're fine.