Swimming sub 1:30 to 100m

Hi guys As you can see im new here so if im posting in the wrong topic please dont close this thread. Im 24 y/o male in fit(fit just out of the water😅) without any background at swimming, just learning from youtube vids. At the last 6 month i had the chance to swim whenever i want to so i swam 3 times a week, my averege split to 100m was 2:10 And now after hours of training watching swimming vids and reading about it i manage to sustain 1:53 sec. But it looks to me like my progression is slowing down, My target is to swim sub 1:30 split to 100m. I know its not an easy job but i willing to train hard for it Im adding 3 vids that you can see my technique and maybe i could understand whats my flaws are and be more efficient https://youtu.be/3nBbV68l310 https://youtu.be/01XNRrUUSJo https://youtu.be/9MjjcMsrTA4 By the way sorry about my poor english its not my native language hope you will understands