Discuss and debate your ideas, and seek membership in community where this is encouraged
Work on complex projects to continuously learn about how ideas manifest in reality
Take care of your brain
Write your ideas down. Write them with different words and approach them from different angles. Explore all the details
Have respect for grammar and vocabulary. Utilize words’ specific individual meanings, and expand your vocabulary so that you aren’t misleading listeners and readers by using words that sorta kinda fit what you’re trying to say
Practice meditation to stop the intellect from gaining too much prominence in your mind (this is also a function of the work thing from above)
Read lots and lots of books, including fiction. Not only do you get ideas, but you also get exposure to complex sentence structure and ways of conveying things
Ditto poetry. Ditto news. Ditto rap. Listen till your brain’s exhausted, then take a little nap
Eat well and sleep plenty
Develop your body’s skill. Shoot arrows, play pool, make love, surf, play the violin, juggle, rock climb, etc. Do things that require skill, not just knowledge or creativity.