Hi,
The DCP-L2500D is not mentioned in About AirPrint - Apple Support as an AirPrint printer (other similar models are). This appears to be a USB-only model, correct?
There is a scanner driver for macOS (11) Big Sur. Otherwise a reference is made to AirPrint (which does not help in this case) and iPrint & Scan.
https://support.brother.com/g/b/downloadlist.aspx?c=gb&lang=en&prod=dcpl2500d_eu&os=10065
If necessary, and if you cannot find another suitable solution, there have been some reports about other models using the macOS (10.15) Catalina printer driver 1.5.0 even with Big Sur. However, look upon this as something entirely experimental. It may not work with your printer and the Mac model in question. There is always a risk involved with an experiment. Software conflicts cannot be ruled out. Data can be lost. One may have to erase and re-install everything on the computer. A hardware problem is unlikely, but it is impossible to guarantee anything. Do not do anything if you do not know exactly what you are doing. Always keep multiple backups of important files.
It may be necessary to reset the printing system before adding something new.
Reset the Mac printing system to solve a problem - Apple Support
Add a printer on Mac - Apple Support