If you're already in the accredited investor club, well, then I'd say it might be time to consider moving away from those individual rentals and leaning more into syndications and private placements.Anyway, if your net worth is north of half a mil, or even a million, then you might want to hop on the LP train sooner rather than later.

Access to quick capital allows you to take advantage of cost-saving opportunities, like bulk purchases, without stalling your project.

A fairly reliable wholesaler who buys across the country, and spends $100,000 a month on advertising, also trains people to be wholesalers.

These are professionals with additional training and a stricter code of ethics.

I am a building contract of decades, I have trained inspect dept's, journey in 3 trades, and over $200m in flips under the belt, mostly to pre '78' homes. 

Years ago I attended a training class.

I would add this: the best in their fields train all day/every day.

To put it into terms; I was asked to come a chair a agent training at a big-brand brokerage (KW) which was about REI.

They have a lot of training available for things like prompts, activities, tracking for renewals, etc.

If you are going to expand your market or consider bigger properties, I suggest you investigate some multi-family training programs like that offered by @Gino Barbaro.