Yass reuse or recycle but kinda improve or change the ideas better in a way for me personally. I don't like reusing old ideas very exactly.
most of my "old ideas" tend to be things that I honestly don't wanna look back or like yes,, like what you said, stories I grew out of and lost interest with reasons. Some were even things that I definitely had a bad experience with when I shared these "ideas" with some old friends.
There was always a reason why I dropped or cancelled using it.
but this recent comic I am starting today is a precious old "idea" I had been keeping 10 years ago in my silly drawing book (over the next years I never knew I was going to get back to it in forever because of how silly I think it is) BUT now,, I stumbled upon it, realized how much it made me happy back in the days so, I am reusing the idea with more development, logic and all seriousness pff. I am honestly very happy to reuse this idea, improve it and kinda also brings me more to my good memories when I was younger.
((probably gonna make a meme out of this comparing 2009 version of idea and 2019 version of idea showing my silly childhood art vs now lmao))