Although it may seem apparent, this is the most crucial piece of advice. Examine written English. You can read newspapers, novels, or textbooks—anything that inspires you to read more and learn more.  Your brain will learn English more effectively if you expose it to it frequently, regardless of whether it is your first language. You'll get a natural understanding of how correct language functions the more you read.

Reading will help you develop an intuitive understanding of written language, even if you are still learning all the conventions. Phrase structure covers a wide range of subjects, such as the distinction between independent and dependent clauses and the components that make up a whole phrase. 

Acquiring knowledge of these guidelines will enable you to write longer, more intricate sentences. A lot of grammatical errors include incorrect punctuation.
The use of punctuation correctly conveys how ideas halt, pause, and link in writing. Playing games is a better way for most individuals to learn than studying.

There are several grammar games available online that test your knowledge in an entertaining and engaging way. You may compete against your friends by using the Quiz Your English app. Try Proof It, a game where you have to check English sentences for grammar and punctuation errors, if you're at a higher level.
You should give Fluently a try if you're studying English as a second language. It converts genuine movies into games. 

Your writing practice will accelerate the improvement of your grammar.  Try writing in your diary every day in English. If you're interested in creating short stories, you may give it a try.  Even better, you may send emails or letters to someone you pen friend. You'll be able to receive candid criticism on your work in this manner.  If you consistently make the same grammatical mistakes, ask them to let you know so you can watch out for it going forward.  Proofreading can benefit from an audible reading of your work. Try reading your first draft aloud once you've finished it.  Everything may appear accurate when you read it on paper because your brain will fill in the blanks and fix typos. However, you'll be able to detect any errors in pronunciation while reading your work aloud.

It might be worthwhile to enroll in a class if you want to ensure that your grammar is becoming better.  You may be able to enroll in language classes at your local community college.  Additionally, you may inquire with the English students there about their availability for one-on-one tutoring at an hourly rate. Your grammatical abilities can truly advance with that kind of tailored criticism.