Massive Warping with PLA
Is there room on the build plate for a brim or mouse ears on the corners?
Could also try glue stick. I know everyone on here says it shouldn't be necessary, but in a pinch it does help.
Is the printer in an enclosure? PLA doesn't need to be, but just having something to block any stray breeze can make a difference.
Could reducing % or changing the infill pattern help ?.
Wash bed with dish soap to get maximum sticking.(very important)
Check your first layer, if it is a little to high, it will not stick very good.(very important)
A big brim attach to the model.
Extra: if needed.
Glue stick.(check if your glue stick works, some do not work good).
First layer more heat. To get more sticking.
No wind on the printer.
Print a little hotter all layers.
Try different filament, check for water in filament.
It's a common problem with large prints that have sharp corners. If you access to the design files, add fillets to the corners. If not, @darcshdow and @peter-m26 had good suggestions. In my hands, adding a brim works most of the time, plus glue stick if needed.
Switch to a smooth PEI build sheet for PLA.
Avoids all the adhesion problems with the textured sheet.