Because I don’t read verbally (that is, I don’t mentally read “out-loud” to myself and listen to the sounds in order to interpret the meaning), there is nothing–NOTHING–that throws me more than the wrong homonym. If you want a concrete tip to make your writing easier to read, this is a good place to start.
Become religious about using the right to, too, or two. Be militant about your there, their, they’re’s. Learn the difference between effect and affect, accept and except. Google every idiom you use to make sure you have it right. I GUARANTEE that you have at least one wrong. (I have rooted (not routed) out more than one in my own writing.)
LOOK EVERYTHING UP UNTIL YOU KNOW YOU GOT IT RIGHT.
And then ask someone else to read your stuff, someone you’re pretty sure gets this right 95% of the time. Because you already know what you’re trying to say, and these mistakes will be invisible to you.