@dollfaceme23 If you're at home with a doorway pullup bar - do grease the groove method where you just do one negative every so often throughout the day. If not, try doing a workout of 3 sets. You've said your max is 4s, so do 3 sets of 2 seconds say, maybe even 1 second if you need to. The benefit of doing 3 sets rather than 1 big one is it gets your body used to the movement and full range of motion.
When you can comfortably do 2, 2, 2, for example, do 3, 2, 2. When you can comfortably do that, do 3, 3, 2. Keep going in this pattern, i.e.
3,3,3
4,3,3
4,4,3
4,4,4 etc.
For reference it took me about 3 months of negatives before I could do a pullup, and most of that time felt like I wasn't making progress. Pullups are really hard, and it takes a lot of time for your body to develop your back muscles. Be consistent, follow a pattern, and trust that your body is building muscle. Good luck!