Sorry to hear that you are not happy with the gen 3 Airpods. I just got mine today. I actually went into an Apple Store to try them on first as I'd seen people talking about them being to big, hurting ears, falling out etc. I have to say I am super happy with them.
My gen 1 Airpods are still kicking, although the battery life is starting to become noticeably shorter. I've had them just over 3 years and use them most days for a couple hours at least. I also have Airpod Pros that I got for riding the bus where noise is a big issue, but then the pandemic happened and I never ride the bus. I still wear them sometimes and love how they sound, but noise cancellation is overkill at home. That and the silicon tips make my ears itch haha.
The 3rd gen Airpods seem like a nice middle ground for me. The 1st gens didn't fit my early quite right, and so I would have to either fuss with them a lot or put the little fuzzy wraps over them like old school headphones have or the bass would be barely there. The new 3rd gens sound great, and fit me perfectly. I've been wearing them for about an hour now and can tell that they will have the same invisible (to me) feel that the 1st gens do. I'll report back if that changes, but first impressions are these are great!