My Moon Druid already has multiclassed with Monk gaining Unarmored Defense for AC improvement and Touch of Death from Way of the Long Death for the temp HP. This is still not enough to keep the beast for alive until the end of most encounters.
I know taking more Druid levels instead would have given me access to forms with more HP, but I do not want other beasts, I want my beasts tougher.
Specifically I really like the attack abilities of the Giant Constrictor Snake.
How can I increase the HP or the AC further? Spending the spell slots on healing is very inefficient, and as a Monk I can do better things with the bonus actions.