You haven't given this a lot of time. This is going to be a couple of years, not several months.
Think about something your property can offer that is really needed in your area and make that your thing. For instance Pets. People don't just want, they
need, homes for their four legged family members. Consider the bigger dogs like labs or boxers, both very family oriented.
Consider additional review of denials. For example if someone was denied because they recently went through a divorce and their credit was destroyed but are making something like six times the rent and you know they would be a good renter otherwise, then reconsider. The second chance renters are awesome.
As for the existing tenants, don't try to make up excuses and instead agree when they complain about noise and mess during the work: Agree and thank them for their patience.
Figure out who are the social butterflies of the community and during a conversation let them know that you have an agenda that is 100% backed. It is your job to clean up the property. Those who are on board will reap the benefits and those who continue to make trouble will be gone. Plain and simple.
And you're going to have to be the best salesperson in the world. I mean a real salesperson not customer service/leasing agent. You're going to have to promise them the world, get them to believe you can deliver it and then go for the kill. The tenant's reward will be a clean, quiet community. Also make that clear to each and every prospective renter: This is a clean, quiet community. Include that in your advertising. If that's what they're looking for then that's what YOU will get. (...if you build it they will come)
I'm not going to tell you it's easy, but it can be accomplished. And everyone will know it was Jasmine who did it!