Welcome to the forum Hank A.!
Some of your questions were covered a bit in this thread: https://retipster.com/forum/topic/1128/what-am-i-missing
Whether you decide to go after larger deals for cash, or smaller deals with seller financing (or some combination of the two), they're all valid stratgies with plenty of examples of people who are doing well at it.
If you've followed me closely, you probably know I rarely make "recommendations" about where people should work or what types of lots to go after, because there's so much variability (and I also don't want to clutter up a few specific counties just because I found a few deals there). I try to give really good instruction about the basics and let people use their imagination and intuition to find their way.
As for what you should do, I think it's just a question of finding your "niche within the niche" (which land type or market you should specialize in), and the only way to do this is by trying things out and bumping into the rails a bit until you find your groove. Some people get lucky find it quickly. Other people have to cast out their line a few more times before they get great traction.
What has me more confused is that I listened to a fairly recent podcast with Seth and Jaron, and they were talking about branching out into multifamily properties. Are they moving out of land investing and onto seemingly greener pastures?
I'm not sure which conversation you're referring to, but we've talked with a lot of other non-land investors on the podcast. I know Jaren Barnes has been a lot more immersed in that world over the past couple of years, but I can't speak for him. I haven't personally done anything with multi-family properties.
A lot of land investors (including me) are active in other strategies outside of land as well. Learning and trying a new investing strategy doesn't mean you have to abandon one for the sake of the other. For many land investors, it's a stepping stone strategy, but not the final destination. Flipping land is a great way to generate cash at a faster pace so you can buy the apartment building, build the storage facility, invest in that syndication deal, etc - because it's a lot harder to do these things if you're limited to just your W2 income... but land deals can change all of that.
If you haven't thought about what might come next after you've mastered the land business, you probably should! There are a lot of possibilities once you've got some cash to work with.