I would say that for "All these things make me ...", which avoids the question of "les" or "des" (if you want to avoid it), but it's a nuance away from "These are the things that make me ..." (different emphasis).Could you not say:
Toutes ces choses me rendent content(e)?
Very good point. Sorry, I hadn't noticed the title was different from the body text. OK, firing squad for kos .I basically translated the subject title, (as people are supposed to put their questions there), which was "All these things make me happy." [...]