Split the download into 2 archives
or
Use butler
or
Ask support for more space
or
reduce the size of your game
Viewing post in 1,5GB game
This contains every possible option to upload bigger projects. For clarity I’ll add more details:
Split the download into 2 archives
The restrictions on project size are mostly to make sure Itch is not spending too many resources on a project that is not really giving a lot back. I’m not sure if this would be allowed, not to mention that some users wouldn’t even try. This also will make a project unplayable through the Itch app. Restrictions are there for a reason.
Use butler
Using butler one can upload a bigger project (I believe up to 2GB?). I totally recommend this path as it sounds like it would solve OP’s problems.
Ask support for more space
This is the alternative to using butler. Support can allow bigger projects. Keep in mind support might not agree to that though, depending on multiple factors.
reduce the size of your game
That would be the “everybody wins” solution, but different projects have different needs. Hard to tell if OP’s project can be optimized, or if OP has enough time for that.