Advanced core workout

This is my current workout, and this is where I am at regarding a straddled front lever hold.

Core / Lower Back Workout (3 sets)

Advanced Tuck Lever Raises Side Plank (1minute+) Dragon Flag Negatives Superman Raises Kneeling Abb Roller Hollow Body Hold (1minute+)

Feel free to give me tips on the front lever and whether a better exercise should be swapped out.