Macro Autofill Dynamic Range with Multiple Data Sets

Hi, everyone!

I have researched for the past three days on this matter and have not discovered a post similar, so I'm deciding to just post a new thread and ask myself.

I am attempting to use macro to autofill two different ranges in the same spreadsheet from the command of a button. Since my ranges can change in the amount of rows that have data, I would like it to autofill for a dynamic range. I have tried many different codes, and I have one that works, but it doesn't work exactly as I had hoped. Here is my information:

Range 1 is from F4:J50. I currently only have data from F4:J15.
Range 2 is from F54:J80. I currently only have data from F54:J60.
(*I will never need more than 50 rows per range)

This is the code that I have currently:

Sub Recalc1()

'Recalc1 Macro

Dim Lastrow As Long

Lastrow = Range("F" & Rows.Count).End(xlUp).Row
Range("F4:J4").AutoFill Destination:=Range("F4:J" & Lastrow)

End Sub

This code works perfectly except it stops at the end of Range 2. I need it to stop right before Range 2 and then start up again at the beginning Range 2. Is there any way that I can have the autofill stop at the end of each range, but still adjust to each dynamic range?

I would post my spreadsheet, but I work for a government agency and it has classified information. If it would make it much easier for everyone, I can make an example spreadsheet using different data.
I really appreciate your help, and I hope I have been clear.
Thank you!
Rae