Where do you live?
What is the terrain like? What's your dwelling, house or apartment?
How close are your neighbors? Is it urban? Rural?
If rural, are there varmints?
I ask these things because those are points that would influence my decision to maybe keep an AR rather than selling it.
I have "some" guns. I have a couple that I've never shot, a consequence of logistics (ammo prices, availability, stuff like that), but there is no way I'm selling either one. When I bought them I had specific things in mind for them. Not their fault that I've managed things poorly and not gotten those things done.
I am of the opinion that I'm missing a caliber from my stable, and I will want to get both a sidearm and long gun in that caliber. I don't plan to sell anything in order to accomplish that. This brand of pig-headedness has meant that I wait and accumulate cash slowly.
Selling firearms, over which I've spent considerable time deciding a) to get them in the first place, b) why I want them, c) what they're good for, d) what other things I can do with them, such selling is kind of a non-starter for me.
The only thing I've ever sold was a snubby revolver that hurt my hand and was awful to shoot. I learned much from that encounter.
I have one thing I'd be inclined to swap straight across for another caliber in the same item, but sell it? Nah.
So, if I give you advice based on my own bias and prejudice, I advise "don't sell, but instead take your time and add something new as cash flow allows." ... Also ... "Meanwhile, take that AR out and familiarize yourself with it, get comfortable with it, get good with it."
But that's just me, speaking from my own limited view.
Have a look over the questions above and see if the answers suggest anything to you.