Why?
Unless it's OLED it's not a big deal.
Find other cravings than technology - I mean .. I am also in the same spot as you are but less stressed about it.
When I bought my 2018 15 inch I wents nuts because the 2019 was released... guess what?? Who cares

Just chill and let it be... make 4 years upgrade cycles when you see big bumps
Save your $$$, live your life, see nature, visit the world. Much better investment. Don't give all your money to Apple's investors so they go to visit the world, see nature, live their lives