I'll give it a try:

Use what you can understand.

When you fully understand something, it is easier to fix it, to use it and to combine it with
something else.

Break your habit when it makes sense.

When you realise that something you used or did was wrong, search a better alternative and use it.
Even if it is painful, even if it is obscure. Drop QWERTY, drop windows, drop systemd, drop unix (for Plan 9).
If it seems more clean, move out of your comfort zone, dammit!