I dont know what I am supposed to buy. AutoCAD/Revit/Cyberpunk - 1080p screens

All I want to do is my work without it lagging. I work in construction and i have managed to set myself up nicely for the next few months to work on a few contracts but I need a new pc as it freezes browsing reddit. I am so overwhelmed by all the hardware that I honestly have no idea what to buy!

I see some half decent prebuilds (sorry can't do a build my own do not have the time unless there are builders in the UK?) from PC Specialsit through online retailers or just a straight up lenovo legion.

I want it to last the next 10 years for work and some half decent gaming. I won't be going up from 1080p to 1440p or even 4k. I am going to be here for a while.

What should I do? What is a good graphics card that will let me work and also play?