Hi, need recommendation for laptop...

1. Budget: Below 3k, can stretch up to max 3.8k if worth

2. Usage: For exam (need Microsoft Excel + view file in pdf), web-browsing (multiple tabs at a time), watch videos/dramas, 0 gaming for now

3. Requirements (display size, battery life, weight etc):
- Long-life (important, plan to use for long time), cannot tolerate laptop that heats up fast
- Must be able to use wifi 6, bluetooth, mic & webcam
- Best to have numpad for exam, good screen & sound quality for video/drama
- RAM: Preferably 16GB, min 8GB
- Battery life & weight: Flexible, but preferably good battery life & light weight (mainly use at home, seldom bring it around - maybe once a month)
- Screen size: 13 inch to 15.6 inch
- Wait time: Best to get by end of Oct2021, latest by end of Dec2021

If possible, can I have a few options to consider...?
BIGGG thanks!

What about ThinkPad L15 AMD or ThinkPad L15 Gen2 - build your own (intel or AMD)? Any comments on these?

If ignore the wait time, are they good? Or are there better options with similar price?
Since I plan to use for long time, I really wish to have 16gb ram + numpad + WiFi6. I don't mind the laptop arrives later, as long as pay by this year end for income tax.