My MacbookAir M1 8GB usually gets hotter after having mainboard replaced.

I've just bought a Macbook Air M1 8gb for 3 months. One day, it became crazily hotter after I had a 30-mins zoom meeting and turned off its screen. Then it had mainboard replaced, only after 3 months @@ though I just used it for office tasks, zoom meetings, and web surfing, no photoshops or any designer apps. Now, I have my laptop fixed for about 1 week, and I see it gets hot very quickly though I still have my daily tasks (office apps) and web habit. I usually have to shut down it for a while but it again begins hot when I run such tasks. What should I do now? Please advise. Thank you.