How can I add more storage to a persistent usb with Linux mint on it?

I have created a persistent usb with Linux Mint on a 128 Gb thumb drive. When I first created it I guess I only allocated 80 Gb for persistence. Now that I have been using it for a couple months the storage I have to work with is running low. I don't use this usb drive for anything else but running and working on Linux Mint so I'd like to use most if not all of the 128 Gb towards this. Is there a way for me to add more storage (increase the partition size allocated for persistence) without having to create a whole new persistent usb with another drive? Some more in-depth information if needed: - Linux Mint 12.1 - Cinnamon Version: 5.6.8 - Linux Kernel: 5.15.0-56-generic *****EDIT***** I did some more digging and found this menu: I notice I can resize Partition 1 to be less, therefore allowing me to make Partition 2 larger. I am guessing that Partition 1 is for the Linux Mint OS and Partition 2 is for all files saved for persistence? Are there any downsides to doing this? What is the minimum amount of storage I should make Partition 1? *****Update***** I created the persistent usb using Rufus. I also have this terminal output for more information:

mint@mint:~$ lsblk -o name,size,fstype,label,mountpoint /dev/sda
NAME     SIZE FSTYPE LABEL      MOUNTPOINT
sda    119.5G                   
├─sda1  44.5G vfat   LINUX MINT /cdrom
└─sda2    75G ext3   casper-rw  /media/mint/casper-rw