Try hitting it straight!!!
Find an instructor with a trackman and video, and see what they come up with.

An instructor can easily identify an out to in swing path. That is the number one cause.

That is also the best person to identify the cause of that swing. With multiple possibilities, the instructor will identify it with 3 slices an a camera. Then give you drills to relearn your swing.

Sometimes when I have the slice for the day with my driver I take the stance like trying to hit a draw. Linebyour ball up with your feet and all that like you normally do, place the ball 1 ball infront of where you normally do and the. Drop that back foot. It works for me and it’s literally my new stance for driver now. Idk it works but It does for me! Hope this helps

A slice is caused by side spin. The more loft on a club the more back spin the club imparts which helps counteract the side spin.

I always thought that I lined up my shots with my feet and the PGA pro I went to asked me if I hit my shots with my feet. I laughed and said not hardly. I listed to what he had to say about my stance and set up from there and he cured my slice to a slight cut and started hitting it in the middle. Lee, please go see a professional. I worked with him yesterday, again on placement and my biggest issue overswinging. Not all of us swing the same and not all of us have the same problems. That is the only advice we offer, if we are trying to help someone. Go see a professional with an open mind.

Might add that he explained that the swing alignment begins above not below the waist. After working with me and making me a believer, it did work. With respect.

I second this... you can get 100's of opinions but go see a teaching professional and spend some time with them so they can help you.

Yes, yes, yes...best advice is to go to a qualified instructor. However, just looking at your picture posted in the original post it looks like the club is finishing down your back instead of around your neck. That's the tell-tale sign of a steep downswing. How you're getting there can be best identified by an instructor but for starters you can do a little self analysis. Get into a good finish position with the shaft going around your neck and backwards engineer how you are swinging through impact. It may be as simple as you stopping your upper body rotation. Again, professional instruction would be able to identify what could be a variety of swing faults.