=IF formula for number range = text

I have a excel sheet that is to be displayed and automatically change daily when others are updated. I am having issues with the IF statement not working, i havent had to mess with it in a while and might be missing something but it seems to me that its just not picking it up.

i have this in the cell F8 where is says million in bold =IF(J29<=999999,"Million",IF(J29>=1000000,"Billion")) for if the cell is under 999999 it will say million and over a billion it says billion

i also have the cell D8 where is says 7.5 and need help in that too. I have =IF(J29<=999999,LEFT(J29,3),IF(J29>=1000000,LEFT(J29,1)&"."&MID(J29,2,1))) which i thought if a cell has for example 750,000,000 it would do the first if and only take the first 3 numbers and input 750, and if the number was 1,600,000,000 the second if would be used and take the first number "1" add a "." and then the third number "6" and do 1.6. When i do that no matter what number is in the cell it automatically does the 1.6 formula.

I have the excel sheet attached here and highlighted the two cells im having trouble with in red text and the cell they both reference in green if you want to look, i could really use help with understanding what i should do.

Thank you