Will I ever be able to downgrade from iOS 26.3.1?

So I got my iPhone12 a couple of months ago and I loved it. Even though the battery was not that good but for my daily life it served me quite well and the phone was responsive.

One day I got curious (stupid) and installed the iOS26 update and now I regret it so much. Not only do I hate the look and feel of the new UI, I feel like it became a bit slower. I also notice bugs here and there, so I hope there is a way I can downgrade back to iOS18, though I don't wish to jailbreak my iPhone.

If it's not possible, any tips/recommendations to make the phone look more "opaque" will be appreciated.