LeadSherpa is a good service i had a lot of experience with if you want to go that route.The two best strategies I’ve found are inbound methods: direct mail and Google Ads.Direct mail can be expensive, but it can also yield highly discounted properties.Google Ads, on the other hand, doesn’t require data extraction like calls, direct mail, or texting.

I will answer as it relates to traditional BRRRR, in the general case there are additional options.  1) Do not perform maximum cash extract.  

However if I do a BRRRR I can achieve infinite return by extracting all of my investment.

Assuming you have a loan on that property you co-own, you'll need to "extract" that equity somehow and convert it to cash to be able to use it on another property. 

However if I do a BRRRR I can achieve infinite return by extracting all of my investment.

After closing on this deal, I like to reflect and extract lessons that I’ve learnt along the way.

Nowadays, most of my business is by referral, however I do work weird lists and extract further data to create proprietary lists for my own use.

If you're solely focused on extracting the maximum value from the property, you might end up working against yourself.

My first 6 RE investments achieved this infinite return as I extracted all my cost via a refinance.  

Give a pro rated invoice if you must, but when I do, I try to extract a couple of extra months to get the expiration to a month that is in my favor.