As always it depends on the price you pay for your upgrade. Why the 3080 specifically? What kind of performance uplift are you expecting? A 3080 is probably gonna fall asleep at 1080p.
A CPU bottleneck won’t give you crashes by itself, unless there’s something else wrong with your system. It just means that as you reach higher framerates (whatever the cause, better GPU, lower settings or resolution etc.) your CPU will be the limiting factor. For most games that might still be comfortably within your expectations, even if your GPU isn’t being fully utilized. The main outliers are mostly esports games on lower settings and resolutions. If you play graphically demanding games on high settings or want to upgrade to a higher resolution at some point, then knock yourself out I guess. I find it kinda hard to guesstimate how “efficient” a GPU upgrade will be, since it depends on so many factors. If you can, then you may as well just give it a try, see how you like it and send it back if you’re disappointed (assuming that’s easy to do where you live).
I haven’t seen this episode yet, but most of the low budget comedy anime adaptations fuck up the comedic timing in my experience. Mostly by lingering too long on random shots (padding the runtime I suppose). Uzaki-chan wa Asobitai comes to mind.