(House- Land) but since land changes in value how do I know what value the land is given?

The way I've narrowed it down is by:Gathering data from all 50 states (population growth, median income, crime, price-to-rent, etc.)Filter out states that have rent lawsFilter out blue states (not because of political beliefs but from my understanding they have less rules and regulation and I believe that in the current climate we're in with COVID and all people are going to flock to areas that don't have as much regulation)Highlight states that people retire in more than othersBecause of short-term rental becoming a trending way to invest, filter out states that impose regulation/rules against short-term rentals using platforms like Air BNB, etc.Also, using ZILLOW, I type in my parameters (homes under $125,000, sqft.

There are other data sources predicting the exact opposite. 

Great asset to keep with around 6.5% ROI.However, recently due to EXPO and other reasons the same property have appreciate in value by more than 24% which is great and I am currently thinking of selling and reinvest again later when the market goes down (after expo) or perhaps go bigger with multiple doors strategy.I am not sure if this is the right decision to make?

Before you throw $500 at the idea make sure you have the data. 

I did exactly this for my duplex purchase and his time was invaluable. 

Many of them have gone up 50% in value in the past five years and I would have looked like a genius to pick them up. 

(i.e. 8 Plex about $600k in value that has not be renovated in 15 years, etc...)

There is a ton of data on here covering nearly everything. ;)

Can anyone recommend a good data visualization tool for population, job growth, etc.?