From what you've said, I believe you would like to sell the bag. You haven't used it in 3 years+, and it seems that your bag may be better in someone elses' hands.
However, I also believe that there should be room for more thought. I've had a similar experience with my speedy 30. I used it in the past, but then stopped using it because it has become very ubiquitous, and I acquired many other bags. Back then, I decided not to sell it, because it was my very first designer bag. After a few more months or even years, I really tend to reach for it on a regular basis! I have fallen in love again with my speedy, and admire those (ubiquitous!) speedies I see in the streets. Now I also consciously rotate my bags, so that they get a healthy balance between some use and some rest / "recovery". Like so, your bags won't show signs of wear and tear as quickly as they would if you used one or two bags non-stop.
Also, there are social situations when Chanel bags may not be appropriate. So you better think about a back-up for such occasions, which potentially could be your Alma.
I feel that decisions should not be made on the basis of strong emotions. So the best way to proceed is to wait a bit, until you are ready to decide. You may think about the situations when you could use it, and reevaluate its usefulness, beauty, and frequency of use before deciding. After a while, and with some distance, you will be much more sure about your decision in favour or against your Alma. HTH