Even though the monster cannot regain health, he does have a rather large health pool that increases every-time you evolve. On top of that, even though he cannot get his health back (except with certain perks), know that he can easily regain his armour if given the opportunity.
It is important as the monster to consider this:
- WHERE to engage.
- WHO to engage.
- WHEN to stop and retreat.
The WHERE means to look for a favorable area to engage the opposing team. You want to look for a place that has the least possible means for kiting (term used to describe Hunters evading monster actions by jumping on objects, climb on objects, run around objects).
The WHO means to only focus a SINGLE hunter that is giving you the most trouble. THIS requires knowledge of each Hunter and what they do. Most of the time you will focus on either the Support or Medic. After all, with the support or medic weakened, the team in general will be more vulnerable.
WHEN is also very important. Sometimes, or perhaps a lot of times, an engagement is not going in your favor and you are not making a dent. In that case it might be wise to try and regain armour to avoid losing more health. Run to the other side of the dome and find a hiding spot. Crouch and remain still so your armour bar regenerates. Bad hunter teams will follow you as a team, so you can easily traverse from one side of the dome to the other side until your armour bar is replenished. At that point, you can easily wait for them to come to you, burn their jet fuel and re-engage.
I’m sure many people can provide you with gameplay videos from past tournaments or even their experiences in general, as that might be helpful as well to know more about the tricks and trade of being a Monster.
Hope it helped!