There's a guy who has written a book about it up for sale on Amazon (search "Missouri tax sale") which might have answers to your questions (I have no affiliation with the author).

IMHO its a all of the above times, post cards, door knocking, SMS, face book PPC and ads in marketplace... 

I have just started with a bookkeeper to do my 2023 book and going forward.

For example, I can get up-to-date pictures of a property (with time stamp on it) for as low as 10$ in 24 hours, most of the time it is more expensive to grab your car and go there in person if you also count your time invested. there is a great book called "long-distance real estate investing" by David Green (you can find it in BP book store or on Amazon) which goes over a lot of those services and find solutions to long distancing investing.

In the meantime I read every book I could find on commercial real estate; attended every commercial real estate meeting in the Houston area, and spoke to numerous commercial brokers.

My lender was pretty adamant about going by the book on the seasoning period. 

If you want to brush up on PML, I suggest you check out my book Lend to Live: Earn Hassle-free, Passive Income in Real Estate with Private Money Lending available on the BiggerPockets book store.

You get repeat guests who book directly from your website by EXCEEDING expectations, not barely meeting them.  

This book will teach you everything you need to know and so much more on managing remotely. 

There is still enough wiggle room to do better than LTRs - but bookings have slowed down due to so many rental options.