I think you have a great tempo, looks like a great start.
You may have tried a lot of different techniques with your wrists, arms, release points and everything in between to rid yourself of the slice. I can tell you with 100% certainty that the primary reason behind your shot shape is that the club head path is "over the top". Your club path on the takeaway starts to the inside and on the downswing comes down on the outside. Probably the most common swing on the planet. You would want to reverse that in the drill below which will help you to feel an outside takeaway and an inside downswing.
I recommend this exercise frequently because of the lasting effect it brings to the golf swing in terms of straightening a fade or slice shot shape.
It involves using 2 range balls to exaggerate the inside approach feeling in the downswing path. It's pretty straight forward, you want your club to pass inside the rear left ball on the downswing. Your body will adjust or compensate in other areas to make a swing happen, so just focus on your club head path.
Translating it to the course means picking one point along the target line (in black here), swing inside of that as reference when taking your practice swings to feel the inside club path before hitting. You can also use the same method when you make your actual swing at the ball...assuming you don't have much else going on in the brain!
**Remember that the left-inside ball is a reference for exaggerating the feeling of an inside swing, if you actually follow this uber inside path it will be a push or a hard draw shot.
I hesitate to recommend much more because you look like you already have a good tempo, athletic posture, grip and alignment probably sorted to the current fade result, etc. I would recommend to work on the path as the primary culprit and let your body naturally adjust to that path before continuing on to other improvements. If you want to post some videos of the drill or shots after the drill I think I can help more regarding power or consistent ball striking.
Hope it helps