Stability can mean a lot of things, see here for my thoughts on that.
A few things I would recommend:
- Do updates as frequently as possible, the more you wait, the more risk of introducing issues.
- Use the LTS kernel unless you have very new hardware that requires a newer kernel.
- Don’t install lots of extra packages you don’t use.
- When adding or removing packages, read the list of packages that is about to removed/installed to ensure it looks sensible.
- If something goes wrong, don’t panic and start taking random actions. Approach the situation calmly and resolve the issue. If you need help, ask.
Arch-based distros rarely if ever need to be reinstalled. You can run the same installation as long as the hardware lasts.