If your Mac is not supported by the latest MacOS version. Worry not, you can use this open source software that will let you extend the life of your otherwise healthy and functioning Mac machines by installing the latest OS.
Visit OpenCore Legacy Patcher here https://dortania.github.io/OpenCore-Legacy-Patcher/ and follow the instructions.
My Macbook was stuck at Ventura, but now I am able to run Sonoma. All my tools, homebrew and casks and other softwares now work and dont complain about deprecation.