Large git rep push error

[Marta Rossi]

Hello, I have a quite large rep to push to github using Sourcetree (about 13Gb - it's an Unreal Engine + Max/MSP project).
When I push the main I get those errors:

git -c diff.mnemonicprefix=false -c core.quotepath=false --no-optional-locks push -v --tags origin main:main
fatal: mmap failed: Invalid argument
fatal: the remote end hung up unexpectedly
send-pack: unexpected disconnect while reading sideband packet
fatal: the remote end hung up unexpectedly

For what I understand on github you can upload up to 15Gb, but I'd probably need LFS? First time using Sourcetree, so any advice greatly appreciated.

Thanks