Decide what you want to improve, and work on that.
If you want to improve perspective, not only look up tutorials on 1 2 and 3 point perspective, but get out and draw from life, the cars parking in front of buildings on the street, etc.
If you want to get better at people, draw yourself in the mirror, your friends, your relatives, strangers waiting at a bus stop, the kids on the playground.
I don't know what you mean by stiff lines. If they are too straight, relax your wrist some and give a little more curve to them.
Switching accounts is generally not going to do anything good for your status on DA. You will loose watchers, and not only that, you loose brand name (I do not even suggest changing your DA handle, even if you havce grown to dislike it) People come to know you by that name, and if you change it, they are more likely to stop watching because they do not know who you are.
I've taken a look into your old and your new gallery. I can give you quite some tips. I don't know if you will appreciate them or not, but they will definitly help you! I experienced it myself and a lot of other artists did it, too.
For the start: Screw creativity and inspiration! Both of them will come with time. So don't pressure yourself with that for now. You don't need to be super unique and original. Save that for later and concentrate on learning and practising. Break out of your comfort zone and return to the basic. Yes, it could be boring and it is a lot of work, but it will help you.
No matter, which style you like best and you want to work with, study realism. Your style will improve as your skills and your technique. Realism is the foundation for nearly everything. I see that you like to draw humans, so study the human anatomy. No, don't look into "How-To-Draw-Anime/ Manga" books. I've seen quite a lot of them and they are horrible. Maybe there are some exeptions, but for now you won't be able to tell the difference. It's quite funny, because people can't tell what is really helpful and good until they know how to do things. I experienced it myself. Luckily I've never bought many art books, so I needn't get rid of many.
Safe the question about style for later. Even style will come with time.
In short: Make studies! Draw things from life! Draw things around you! Study the basics (light, shadow, colour theory, anatomy)! Leave your comfort zone: Draw landscapes! Draw Animals! Draw whatever you want or not want! Enlarge your visual library! All this will help you to improve and with the time your creativity and inspiration will come back! And between the studies, just draw something for fun.
Don't be afraid to use references. Everyone is doing it, but beware: Referencing isn't the same as copying.
I hope you get what I want to tell you. I don't have anything against your favourite style, but as you see only lurking withing your comfort zone won't bring you anywhere. So, cheer up! Everything is going to be fine. Just believe in yourself and study!
It's not bad. it's just that you should practice drawing real people. it will help your anime a lot. I started off with anime, but my drawing improved once I tried drawing realistic. I didn't go back to anime, but you could. Drawing from life or photos will help you understand the human body better, and it's also really fun. So maybe trying something new could help shake you out of your artblock. Or you could even try something content different and try a landscape or animals.