Hi David,
Congrats on taking action and owning 3 properties! Most people never make it to one.
You mentioned that you work 70+ hours a week. Are your current rentals being managed by someone like a property manager or do you self-manage?
@Jeff White mentioned goals and I'd like to put some emphasis on that. You said that you flipped a house but it took a lot of time. Owning rentals and self-managing is also time consuming. Although not as time consuming as managing a flip. What do you ultimately want to do with real estate? Are you trying to build generational wealth, create passive income, replace your active income? If you spend some time getting clear on your goals, it will help you to narrow your focus on what type of investing you want to continue to pursue.
For example, if you are strapped for time and want to take a more passive approach, multifamily syndication or commercial might be of interest to you. Passive investors are partners in the deal that fund it. While the general partners are actively working the business plan to provide the returns promised to investors.
But I don't want to distract you even more. Get clear on your goals and I think the rest will all come into play.