I don’t know where to begin…
TLDR is pretty much you seem to be a strong dude but to maximise sumo potential and lift max weight technique needs lots of work. As the above poster said you are pulling convention with a wider stance. This way you don’t get the advantages of sumo while keeping the weaknesses of conventional as well as the weaknesses of sumo.
There are many quality youtube tutorials on Sumo DL as well as many more examples of beautiful sumo lifting (some rubbish tho). Watch a few and apply their cues and tips bit by bit slowly improving your sumo technique. For myself when I first started pulling sumo having done conventional all the way up to that point it went kind of like this:
Open at the hips (externally rotate and abduct) so that your knees and feet point out (approx 45 degrees but find what works for you). This means that when you bend the knees they will track out and over the toes as opposed to collapsing inwards.
Drop your nuts onto the bar or lower yourself between your legs while keeping vertical as possible torso position (some people end up 45 degrees others nearer to fully vertical)
Stop as you feel the greatest tension in your quads, hams and glutes. I think about keeping my hips higher because dropping too low relaxes everything.
Set Grip while maintaining all of the above (vertical as possible torso and tension in the quads, hams and glutes)
Set Spine flat or neutral if its not already using the bar to pull yourself into position. Engage lats (externally rotate hands, cover armpits or some other cue)
and finally Pull. Patience off the floor but don’t take it easy. Sumo may be harder off the floor but even at high percentages that should mean maybe 1-2 seconds down there.
Once the bar has broken the floor wedge hips through and finish with a bar hump.