All good comments right above as usual by Qinsp. Regarding leasing if you can't colllect the $7,500, there are other potential hidden costs in leasing if you are not accustomed to it. You either go under the miles and pay more per mile used or you go over, they bend you over, and it cost more that way too. Then there is the turn in at the end where they determine what is normal wear and tear.
If you are familiar with leasing, know the ins and outs (like bro), it can be a good deal as well. For me, buying has always been the better way to go as we tend to keep our cars for 10+ years...so in my use cases buying works, for others leasing can work if they are savvy.
There are no right and wrong answers as to whether to get an Ioniq (EV available here in CA as well) vs. another Volt, just what's right for each individual. Most of us, me included, would tend toward another Volt. I will say that I'm more interested in pure EV down the road and even that Ioniq pure EV model caught my eye, but the range is still a bit short. The Bolt would be more interesting to me but it is missing ACC and that's a big deal for me after having it now. I just drove my old ICE, no ACC of course, and it does change the driving experience to the downside, especially on the freeways here in So Cal.
For the reasons above I recently signed up for a reservation on a M3 as I may be moving my Volt to my son in the next year or two. My problem with the M3 is the form factor. Limited cargo space and I've really grown the like the hatchback of the Volt. Really, the Volt is an almost perfect vehicle, even as an EREV. If they could pop the range of the Bolt in a Volt, or similar sport sedan hatch, I'd be very happy. I'm pretty sure I'll not be acting on that M3 reservation, just preserving an option when my number is in about a year or so. In that time maybe another option or two will pop up with ACC or equivalent in a form factor that appeals to me.
Back to the OP, congrats on the Ioniq hybrid, I saw one in the wild today on the freeway, my first spotting and it looks as good (to me) in person as in pictures. Not a bad choice at all...