I am looking for the best and most practical suggestion as to what any average person can implement on a daily basis to help bring Moshiach. This could be either a positive action or refraining from a negative action. Please provide sources for why your answer should be effective, and be specific as to why you think your answer is most practical.
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In short, do Mitzvot. The Rambam writes (Teshuva 3:4):
This article brings lots of practical suggestions of Mitzvot that are "Particularly Propitious for Hastening the Redemption". It brings sources from our sages about various Mitzvot that were told bring the Redemption.
Here's a bullet point list of some of them, see there for more, as well as explanations and sources:
The Baal Shem Tov wrote in a letter to his brother in law that he went up to the spiritual palace of Moshiach and asked him "When will you come?"
Moshiach answered him "When your teachings will be spread out and will become known in the world, and your wellsprings (of what I taught you and what you understand) will be spread out, and everyone will be able to do Yichudim and Alyiyos like you. Then all of the Klipos will be destroyed, and the time will be auspicious for the redemption".
Be as machmir (stringent) with mitzvos bein adam lechavero (commandments concerning interpersonal relations) as most people are with mitzvos bein adam leMakom (commandments concerning Divine service).
We lost the first Beis HaMikdash because of Avoda Zara (Yoma 9b). Correcting this sin brought us the second Beis HaMikdash.
We lost the second Beis HaMikdash because of Sinas Chinam (ibid). It stands to reason that we must correct this sin to bring the third.
For practical approaches to this, I would personally recommend in-depth study of Likutey Moharan (especially ל״מ א:רפב) and Chofetz Chaim.
We are not allowed to "bring Moshiach" or do anything which would "hasten the End", as the Rashbash (Shailos v'tshuvos #2) writes:
אמנם מצוה זו אינה מצוה כוללת לכל ישראל בגלות החל הזה, אבל היא נמנעת כלל כשז"ל בגמרא כתובות פרק האחרון שהיא מכלל שבועות שהשביע הקדוש ב"ה את ישראל לא ימהרו את הקץ ושלא יעלו בחומה, וצא וראה בני אפרים מה קרה להם שמהרו את הקץ
"that we are are not allowed to "hasten the end" and see what happened to the children of Ephraim who hastened the End."
The bnei Ephraim were said to have left Egypt earlier than they were supposed to and were described as דוחקי הקץ, people who forced or hastened the end. (For more info see here)
So our mission is just to keep the Torah and not worry about God's plans for the End; the idea that we should actively attempt to bring about the End is highly problematic.
Stop lashon hara, stop accepting lashon hara. I'd say this is the #1 thing keeping Moshiach from coming, if we stop lashon hara, we stop senseless hatred, and ahavat yisroel is our biggest motive for bringing Moshiach. Learn Kabbalah, study Chofetz Chaim (laws on lashon hara), Mussar, and give Tzadakah! Make that 10% into 15%. And finally, motivate others to do the same!