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I have written several articles and have not been supported, and there are others who do almost nothing and have many votes

You win some you lose some, welcome to crypto.

If you're thinking about leaving steemit, then go ahead, your SP will still be there in 2 years... Come back in 2 years and check how things are, interests will still grow what you have there.

On the other hand, you can try to create better content or just insist (maybe write at other hours, or on different arguments?) and might be luckier :) This is just the start anyway!

$1500. If you have no need for it, let it grow. It could be worth alot next year. Depends on you.