When you're short on space, a cliché or trope can be the most efficient way to do what needs doing and move on to the real story.
Drafting is engineering and construction. Revision is art and design.
Craft your HEA to fit your characters. Let them surprise you with the innovative solution they all come up with.
Characters take an approach of "How can we make this work for all of us?" rather than "It's too bad I have to choose one of you."
You are totally permitted to just do the fun parts of this and skip the parts you dislike. Hobbies are for enjoying.
Don't try to tell an "authentic" story. Instead, tell an "inauthentic" truth.
Critiques should not make you question the value of your work, or the value of yourself.
Let somebody else write only allistic characters. You can write a character who is probably, or maybe, on the spectrum, but this does not need a huge reveal or internal struggle—it can just be a thing you do, among other things you do, as an author.
Today is the fifth Tuesday of the month, which means that my answer to this heartfelt letter is available exclusively to my Patreon patrons.
As with writer's block, what's getting in the way of self-promotion is not practical but psychological.