Divinity Original Sin 1 and 2, if you haven’t played already. Think of them as the stepping stones for BG3.

Spec Ops: The Line is a 3rd person shooter with an incredible story, I think it takes 4-6 hours to go through the campaign. Short when compared to RPGs, but worth the time. People also talk about Titanfall 2’s campaign being great, I haven’t played it yet.

Mass Effect trilogy is also very good, mainly the 2nd game. The first game is the jankiest of the bunch and the 3rd is much better after all the DLC, though I still don’t like how the optional Paragon/Renegade prompts from 2 became obligatory QTE in 3.