Hi and welcome to GMAT Club!
Maybe I should put together a post about waitlist strategies as I am not finding anything recent.... latest
is from 2017 Meanwhile, I have a few videos to suggest that we have accumulated over the years:
https://www.youtube.com/user/gmatclub/s ... aitlist%20But I would say you have a few options and obviously some that are going to take some effort than others but I will list them in the order of efficiency and effect:
1. Leverage and an admit from a peer school. Does not sound like you have this in hand but possibly something you could pull off in R2? Nothing moves Ross more than when someone comes and says they have an admit to Yale but wish to enroll at Ross and likewise for Tuck, Fuqua, and others. Perhaps you can put a stronger application togehter in R2? While I don't know about the volume, I feel there has been a shift of applications and schools are expecting a shortage of applicants in R2 potentialy which is why some have not denied their R1 applicants but moved them to R2. Anyway, perhapsp you can have some of this career trajectory information appear and surface in your next application? (This is Hard)
2. You should absolutely reinforce the school's perception that you will enroll if they admit you. Nothing is more annoying and damaging to the rankings than admitting a person off WL only for them not to enroll so you want to be reinforcing it and reassuring them that if they admit you, you will pay the deposit immediately. (Super easy to do)
3. Schools do allow updates to the case/file/application if you have any updates and I think the letter from the HR director could be it. I would not rush to submit it though. You want to have multiple angles of attack and the school is only willing to consider only so many letters/etc (and takes them with a grain of salt) since they know you are doing it after the fact and they have to be fair to all those who they denied and did nto give a chance to send in a letter/etc
4. Updates are good in general so having more than 1 update would be nice to show you are working hard to improve. Reaching out to the adcom about suggestions to improve is a good strategy. While likelihood of them giving you a helpful reply is not great, the value in a chance that they do is huge and there is no downside as long as you do it professionally and don't make them feel like you are asking for something unusual or an exception. However, schools don't often give advice as they don't want it to be unfair.
5. I would not rule out the GRE option and potentially float as an option to submit a better/higher score but only if you are prepared to do that.
If you have someone like an alum or a current student you know, it could be awesome to have them review your apps and essays and see what they suggest. Never know what may come out of it. Also, may be helpful if you do bite the bullet and try R2.
BB.