Sedate, take care.
I have no doubt you will reach this goal some day. Your love for the sea and your determination speaks out: yes, you can.
But are you sure you can do it NOW?
From 32 to 50 is a big improvement, too big IMHO. It's a big step from your previous personal best, your goal is very deep, and moreover, you didn't mention of anybody qualified being next to you for specific training in preparation before the attempt, and neither for qualified assistance in case of accident during the attempt. This way it's a big NO.
Follow Erik's and Sanso's advice: learn, read, dive, improve step by step. And you'll make it some day.
