My hair doesn’t grow any longer than this

I get regular trims every 3-4 months. Sometimes I even cut off a few inches but when it grows back out, it literally never grows any longer than this. My hair has been this length for years! And I do take Biotin. Any advice?! I really want my hair to be longer than this.. last time I got my hair trimmed was 3 months ago and I only trimmed off one inch.. it just won’t grow.. what the heck is going on?