There are laptops with good ventilation. My Lenovo Legion is not as chunky as your Asus, but has a big open mesh across a large part of the bottom, and pretty large exhaust vents on the rear and side corners. Plenty to keep the 5800U and RTX3060 cool. At this point in time I would really consider looking at a new laptop rather than sink money into that old one. Would be money better spent, but it is your choice in the end.What bugs me about new laptops is their thickness. I've heard the fans on these newer gaming laptops, quite loud, and tons of heat coming out. My laptop has huge vents, which is better than tiny vents.