How can I overcome a writer's block?

Well, you've failed to mention whether it's fiction or non-fiction writing, but how about writing up a list of idea fragments that you write down quickly without an attempt to make them perfect?

Quit posting nonsense on sites like this and buckle down and get writing whatever it is you're writing.

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Mame, you are a character. Your advice to the guy with the writer's block is "Get writing!" What is that - 'tough love'?

Start small projects and work your way up. Try working every day by writing something…even if it’s for practice. Good daily habits will help overcome the habit. Try doing some finite tasks such as building up a short story. The as the habit of doing these daily tasks continues, you’ll be on you way to breaking the block.

Don’t look to the top of the hill while climbing a mountain ⛰ but look at the steps in front of you.

..the habit of being blocked