Lighten the trigger to min weight plus 2 ozs.
Get yourself the least expensive ammo that will shoot well at 20yds. There is a target with the animals scaled for 20yds (I can send if you can't find).
Practise, practise, practise - repeat another 5 thousand times.
In time, you will gain some muscle strength and find your rhythm. You want the cleanest breaking trigger you can make. Then its just practise, breathing, form, and watching the bouncing dot (I like dot reticles).
You never really hold still but your wobbles will decrease in size. At one point, I was able to hold inside the pig and ram. Still missed but did get some 5 in a rows.
The position you take must be comfy to you. move the supporting hand as close to the body as possible. I usually had it in front of the trigger guard under the mag. If you are lucky, your elbow and hip can meet. That is great support.
I tried to make my wobble as repeatable as possible. Some go in circles or figure 8. Whatever works for you. The goal is to break that trigger as the dot gets back on target. Follow the bouncing dot.
A scope with reliable adjustments for sure. You might find low power to help at first but eventually, you will want/need more. I never went past 24x. Some shot with 32X.
Testing with quality ammo for match shooting (Eley or Lapua usually shoot well but Wolf match is supposed to be great if you can find it). You don't necessarily need to highest/most expensive grade. Testing will show you what it likes. It should shoot 5 rds into 1" or so at 100yds in dead calm conditions. More practise.
Jerry
