A lot of people have asked for tips on how they can be a better writer. Although there will be varying responses from some of the best writers on the planet, you should realize that there are specific steps that you can take in order to continue to master your craft and be the best at what you do. Sites like Grammarly have really spent a lot of time making sure that they are able to help out in producing work that is free from any spelling mistakes or grammatical errors. The creativity and imagination part though is completely yours.
One of the biggest mistakes that a writer can get into is not being able to write about something that is in their passion and interest. If you want to be a full time writer, it is best to be involved in topics or fields that you are passionate about, or something that you can derive from experience. It may not necessarily be your own experience, as it can be through others too, but what is important is that you are able to enjoy what you are writing about.
As you continue to write, it is also advisable for you to have someone take a look at your work – preferably an objective point of view to make sure that you would understand how you can improve better. Good luck!