The Sabrent Rocket Thunderbolt 3 External SSD for MacBook Air and MacBook Pro is available in five sizes: 500GB, 1TB, 2TB, 4TB, and 8 TB. The Thunderbolt 3 connection can deliver a transfer speed of up to 2700 MB/s when connected to Thunderbolt and 900 MB/s with USB 3.2 Mode. In addition, you don’t need to install any third-party drive or app

And has 4Mb cache compared to 3Mb cache. If you are keeping the notebook for 4 years I would top it out. It's only $230.00 with the education discount for 8GB of ram and the i7 upgrade. $140 for the processor upgrade. It's better to have it than not to have it. It's there when you need it. Better to have it than not.
Let’s start out with the basic specifications of the Apple MacBook Air M1: The most basic configuration priced at $999 comes with an 8-core CPU / 7-core GPU processor, 8 GB of RAM and 256 GB PCIe NVMe SSD storage. A maxed-out configuration with 8-core CPU / 8-core GPU, 16 GB RAM and 2 TB SSD storage retails for $2049.
This video shows you STEP BY STEP on how to upgrade the SSD of an early 2015 MacBook Air to a 1TB nvme SSD, however, this method should also work for the Mac

1. Nope, the RAM on the MacBook Air is soldered in so you won't be able to upgrade it without breaking the computer. You need to make sure the amount of RAM is enough when you buy the machine. If you don't mind you can downgrade the OS (the lowest you can get on 2012 MBA is 10.7.4), that will probably reduce the amount of RAM needed.

Here’s how to upgrade RAM on a Mac mini: Turn off your Mac mini, let it cool down, and disconnect all cords and cables. Turn the device upside down and rotate the bottom case counterclockwise to unlock it. Press down on one side of the cover to tip the other side up, then remove it. 2jq3S. 299 29 473 230 312 498 402 400 142

can you upgrade macbook air ssd