when it comes to laptops there is obviously no such thing as BIFL but I have 3 recommendations.
1: Framework, they are relatively new, but they already have a pretty good reputation and the entire product is designed to be self repairable and not become Ewaste, you could spec a pretty nice one well under budget.

2: Get the best MacBook you can, and hope it survives as long as your current one, the M2 models are blazing fast and as long as it doesn't have some sort of failure it should still run fine in 10 years. The big catch is that if anything does go wrong you're better off chucking it in the bin because they are designed to be near impossible to repair.

3: save some money and get a lightly used ThinkPad from a business liquidation, they run forever can be had affordably, and replacement parts are readily available just about anywhere, with the money left over you could even build a desktop that could last even longer than 10 years.