You can only improve up to a certain point.
While my spergy personality over time died off - and I'm a lot more calm, collected, less stuttery, funnier, and confident in the way I talk, posture, etc.,
The reality is that when you are an incel, a deviation of interests happens from the normie. The normie is obsessed with sex, sexual gossip, social status, and what they do in their mundane lives on a day to day basis. When you are an incel, you develop other interests like video games, nerdy movies, philosophy, religion, arts, history, literature, politics, etc.
Eventually, it will dawn on the normie that you never talk about sex, women, and they will cut you off at a certain point or talk down to you / infantalize you. No matter how old they are or young, this always happens. Women are even more acute to this and will smell it right off the bat.
I have a group of normie "friends" I go to the bar with every weekend. Don't know why they invite me, but they aren't even my "friends" - maybe it's pity. Idk.
There's one engaged girl who became very distant from me after a couple of weeks for no reason. No, I didn't say or do anything incelly - we were really bantery with each other and had a good old time. Her attitude changed out of nowhere.
The other dudes took about a month in a half or so, and one guy figured out I don't date and relentlessly banters with me about how I get no action. All of them switched tones from a respectable man to coddling me like a child, like they are grown ups and I'm a little kid, despite me being in my mid 20s.
All they talk about is who is dating who, when the girl is gone they talk about who is fucking who, and other than that they talk about literally every mundane thing they do at work in their day to day lives and the people they see at work.
They have interests only insofar as one popular Netflix show is on.
I literally told one dude personally about my struggles dating and how I only got two Tinder dates after a year's worth of effort and both rejecting me after a single date (one recently).
The group the very next meetup shot up in adrenaline and ecstasy with a positivity I've never seen before, like I told them the answer to world hunger. "You got a date! How was it? Tell me all about it!"
You will never be normal, but you can at least develop into the person who you want to be. Find an archetypal figure and become that person, you will surpass the normie and can become way more interesting.
You just will never be normal. You will be extraordinary or an outcast, and the line between the two is often blurry.