Stop comparing yourself to other people. None of us is on the same journey.
That said, my hair is on track to doing exactly what yours is. I'm a couple months behind you. I twist and ripped near the mid-end of January. My hair started at boob length. Now some of it is still boob length and the rest of it is anywhere from my ears to my shoulders. I've noticed that the fatter dreads shrunk the most while the skinnier dreads are still hanging out around my boobs.
Ok. I just watched your 4 month video. Your hair looks fine! I was expecting random chunks of undreaded hair but it looks pretty nice and even as far as the shrinking goes...the long parts are all at the back! Mine is the opposite. Sides are long but the back is short!
In a few months your hair is going to stop shrinking and start growing. If you restart you will definitely be waiting longer for real dreading but you will also face losing hair. Even twist and rip damages hair. I redid a couple sections when I first started, only unraveled them after a few hours. I lost a good bit of hair. No problem for me and my thick hair but if you have thin hair you might want to avoid that. The dreads made after were definitely sadder and less thick.
Even backcombed dreads if left unmaintained go through "ugly" stages.Why do you want to go through that again?
Ultimately, what it comes down to is this...Are your dreads for fashion or spirit? There's nothing wrong with either it just changes the advice you should be listening to. If you are on this journey for yourself and your spiritual/inner growth...you will only be doing yourself a disservice if you undo everything you've done and start over. That's not growing. That's falling victim to vanity and insecurity. You have to move beyond those things in order to grow. It's not easy but improving yourself never is.
On the other hand, if dreads are truly just a fashion choice and you just want them to look nice then there's no point in "suffering" through this stage when you can start over and manufacture the dreads you want. They just aren't likely to last as long because neat and tidy dreads take a lot of maintenance and pretty much all maintenance does a lot of damage.
You need to make the right choice for yourself but I'm hoping you stay on this journey rather than start another one. Slap a tam on your noggin and forget about your hair for a while.