You are on the right track, and as others have said, your skiing is impressive for a 2nd season skier. Congrats! But being backseat is indeed holding you back. So I'm going to address that first. You said:
Tried to focus on bringing pressure to the shins but couldn't do it every time -- its hard to concentrate on downhill leg and shin pressure at the same time. Still look backseat in the video footage but maybe better than before.
1. In order to
bring pressure to the shins, concentrate on keeping your ankles bent forward - keep them dorsiflexed. You probably won't be able to concentrate on anything else but this because most people can only work on one thing at a time. So practice on green terrain, which will offer less speed to distract your attention from your ankles.
I grabbed these two images from the internet. The first shows what you focus on- inside the boot lift your forefoot up to contact the ceiling of the boot. This creates dorsiflexiong.
And here's your goal: get the angle of your ankle "closed," aka dorsiflexed, like so:
Your shin will tilt forward inside the boot when you ski this way. That tilt will produce shin-tongue contact. Keep the ankles constantly dorsiflexed. This will be a challenge. Your goal is to make it habitual, so you can do it without thought. Practice, practice, practice. Practice on empty green terrain where the distractions are limited. When you forget and notice that you lost your focus, congratulate yourself for recognizing this and bring the focus back to dorsiflexing.
2. As you are getting successful at keeping your ankles dorsiflexed, also work on lifting your hips up and forward. Do this by opening your knees. The farther forward you get your hips, the more shin-tongue "pressure" you'll feel, and the more weight you will be directing to the shovels of your skis. How much you lift your hips determines how much weight you put over the shovels. Once your dorsiflexion is in muscle memory, you can then learn to manipulate how much shovel pressure you want to have by deciding how much to lift your hips up and forward. More up and forward, more shovel pressure.
--Look at the shin tilt for these two skiers below. The man's shins are vertical, not tilted forward, because he is not dorsiflexing. This forces his hips and torso back, so his weight is concentrated over the backs of the skis. He's in the back seat. His quads are getting exhausted. Not good.
--The woman's shins are tilted forward. She is dorsiflexing. Her hips are up, not sitting back, and her quads are not getting exhausted. She is definitely not in the back seat. That's your goal. The key is dorsiflexion, with hips up.
3. One more thing. Notice how the woman's upper body tilt matches the shin tilt? This is good. Aim for that, once you're dealing with lifting those hips up and forward. It will feel much more natural to get your bent elbows forward of your jacket's side-seam, and keep your hands forward as hers are. That will get your arms in a good position and help your balance, even if you are just holding onto your poles. Those arms weight something too, so their weight has an impact on how much weight is hovering over the fronts of your skis.
4. I have not addressed skiing from outside ski to outside ski, nor how to develop higher edge angles. Nor have I mentioned how to make clean arc-to-arc carves. These can be worked on after you solve the back seat issue.