Like steam does....That would be awesome and much better than currently....

I believe most of the game pages have such a list along the right hand side.

For example:

https://www.gog.com/game/icewind_dale_2

Along the right hand side, I see five suggested games.

Suggestions go here anyway:

https://www.gog.com/wishlist/site

Hope this helps

I don't like how gog handles game suggestions TBH... I simply think suggestions based on my library would be so much better... like there should be engine in which I list games I own and then I'm recommended a game or two...