Help needed to impove my breaststroke

Hello fellow-swimmers! Could you please check out videos of my breaststroke. So far 50m *** is my best distance. But for the last two years I haven’t been able to break 36+ seconds limit (SC). That’s a snippet of 50m at race speed: www.youtube.com/watch I have more videos, but so far the forum allows me to add only one. Mistakes, drills to fix them, stretching exercises? I’m total amateur, 35 years old, it’s my 6th year of competitive swimming. Thanks!