Samkhya Philosophy (https://en.wikipedia.org/wiki/Samkhya) gives a far more comprehensive model to analytically go beyond the three sources of suffering (viz. from own body/mind, from other beings/things, from acts of god).
You can then think of specific practices from Buddhism eg. Tibetan Lojong - https://en.wikipedia.org/wiki/Lojong - and Stoicism as applications within that framework.