Your damage and offensive ability is both rather low (currently you should have like a 70% chance to hit him - against stronger enemies the probability even becomes lower (cannot go below 60% - but everything below 70% also leads to reduced damage)). Also, you have no source of resist reduction, which is also a mean (and in Ultimate a rather important one) to your increase damage. As general hint: to have an acceptable damage, you should try to have % physical damage in most gear slots.
Another note - your investment in WPS (Markovian’s Advantage, Zolhan’s Technique, Feral Hunger and Upheavel) are currently wasted points, Primal Strike is not an auto attack replacer and can therefore not proc them.
Furthermore, your weapons has no component and you also don’t use augments currenty. So there is still lost potential (augments to gear mostly helps to fix resistances)
To give you some ideas - here a slightly (far from optimal) version of your build, removed all points from the WPS and invested them elsewhere - changed the devotions to include at least a bit of resist reduction (Assassin’s Mark) - while I could keep the health regen, the armor is clearly lower (DA only had a small impact, and good roled rings should lead to almost similar values) because of the gear (used either MI’s, factions gear or guranteed drops - belt and amulett have an aggressive prefix to get at least a reasonable offensive ability). There could be much more changed - but to give you an idea in which direction you could develop your build.
Edit: given your low OA, it would likely be even better to use Oleron’s Rage instead of Menhir’s Bulwark, even if this means a loss of tankyness.
Edit2: here you can calculate your chance to hit ,just enter your OA and the enemy DA: 🧮 Critical Hit / Resistance Calculators - DPS multipliers