Your questions seem to be really broad and requires an essay in itself too. Haha. Kidding aside,you’ve actually done what most people would do to craft a good essay. but if you think it’s still not worth an A+ grade, it’s OK to get someone else’s help like, say, a pro writer from an essay writing service. But don’t just pick the first service you’ll see, okay? Read this,
https://www.ihatewritingessays.com/safe-essay-services, to guide you in picking a writing service.