Since you prefer lightweight laptop, I would recommend this MSI Katana 15 15.6" 144Hz because it comes with i7-13620H CPU which is one of the best in your budget and great for your usage, 16GB of RAM for smooth multitasking, Good SSD storage of 1TB for faster boot up and loading, 15.6 FHD IPS 144Hz screen which is a must have for this price range, it comes with RTX 4070 GPU, and high build quality.
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Since you are going to game, I would recommend this MSI Katana 15 15.6" 144Hz because it comes with i7-13620H CPU which is one of the best in your budget and great for your usage, 16GB of RAM for smooth multitasking, Good SSD storage of 1TB for faster boot up and loading, 15.6 FHD IPS 144Hz screen which is a must have for this price range, it comes with RTX 4070 GPU, and high build quality.
Please note this is a U.S amazon link, if you click it from outside of US, you might be redirected to your country’s local Amazon. Please double check the name of the model and the specs mentioned in my comment
Please note I'm using affiliate links which means I'll receive a small percent of the purchase if you use this link at no extra cost to you
With that budget you really have many choices.
Here are few but check some others too, also check reviews:
https://www.amazon.com/dp/B0BV7XQ9V9/