Easiest way to determine downstream from T-Z709?

[bc76]

My first test was the National Geographic Geno 2.0
My y haplogroup was determined as T-Z709. I also transferred the data to Family Tree DNA. I searched through their packs and it doesn't seem that they offer one to differentiate past this point. Is there any service just to check for downstream markers from T-Z709?

[bc76]

I can see which markers I need to be tested for on Eupedia's tree, I just don't know where to do it.