do your research before you make a map, Ive never released a map on the forums, but Ive read a excrement ton of those tutorials and posts, making sure Ive got excrement down before I release something.
Read the tutorials, experiment, then go on other peoples submissions and see what problems they had. See if you can find them in your map, fix them, then repeat this process. Then when your map doesnt look like excrement, realise that it still does, and carry on working on it. Then make sure theres no stupid mistakes thus far in your map making process, and THEN release that excrement on here.
And people tell you straight up that you need to work on your skills as a map maker before releasing stuff, take a hint, meddling darn.