Best Business Structure for Real Estate?

[Luke Masaschi]

Ive been investing for a few years now and have 3 properties which are STR's and all cash flow.

I own all these properties under my LLC which is the holdings and operating.

I have a bank account with Chase where all the money from these rentals is deposited which is under this same LLC and I am a single member.

Now that I am getting ready to graduate college and take investing more serious what is the best structure for me? Ive heard many different ways but I was wondering for my scenario how should I own/operate before its too late. I also want to make sure tax wise I have the best structure possible. 

Thank you very much in advance and would love to connect with anyone!