In my experience, a successful BRRRR typically comes down to two main things: finding a good deal and managing an efficient renovation.

I've included an example below to help illustrate this.So different lenders have different rates (which do vary even for DSCR loans) but these are factors they all consider.See example below:DSCR < 1Principal + Interest = $1,700Taxes = $350, Insurance = $100, Association Dues = $50Total PITIA = $2200Rent = $2000DSCR = Rent/PITIA = 2000/2200 = 0.91Since the DSCR is 0.91, we know the expenses are greater than the income of the property.DSCR >1Principal + Interest = $1,500Taxes = $250, Insurance = $100, Association Dues = $25Total PITIA = $1875 Rent = $2300DSCR = Rent/PITIA = 2300/1875 = 1.23If a purchase, you also generally need reserves / savings to show you have 3-6 month payments of PITIA (principal / interest (mortgage payment), property taxes and insurance and HOA (if applicable).

Of course the goal should be on the first page by anytime but that is usually bad ROI since the price is the biggest factor on the rank.

I guess it's just too many factors to consider and it easy to get overwhelmed and cannot get accurate info and estimation when I conduct analysis (ex. property tax rate, insurance, maintenance fee, rent, repair, closing cost, etc.) 

If cash flow is the main goal, there are many other markets to consider before San Diego.

I'm a fellow real estate investor and I own properties throughout New Hampshire and Maine Southern Coast, I'd love to connect and bounce ideas off each other. 

That will be a determining factor for where it makes sense for you to purchase.Regarding waiting - bear in mind a lot of people were predicting rates in 2024 would be in 5% range or low 6s, which didn't turn out to be the case.

Is that the main goal or something else?

All important factors to consider- population growth or decline, job growth or decline, inventory rate and movement- is is a seller's market getting stronger or softer or a buyer's market getting stronger or softer?

ADUs can significantly enhance your property's value by adding living space that can be used for rental income or as additional living quarters for family members.The increase in value from an ADU can vary widely depending on several factors such as the size, quality, and functionality of the ADU, as well as its integration with the main property.