I'm sure some of this was already mentioned, but here it goes... Read to your children. We set a goal of reading 100 novels to our daughters. We're at #80 and the girls are 13 and 11. Create some traditions. Whenever either of our daughters lost a tooth, I'd write a letter from the tooth fairy. The letters offered advice, humor, fairy "facts" and even maps to buried treasure they could go dig up. In retrospect, I wis…
Just want to put an emphasis on this. If I were to start over this is the thing I’d keep in mind.
I would try to have more patience, letting it take a few more years to progress through levels (books, movies, games, activities). Not because later stuff is necessarily to advanced or age inappropriate, but because everything you choose to spend time with necessarily means thing you choose not to spend time with.
Be where you are, and enjoy the present, the future will come.
And also, on gadgets, the science on child development and screen time has advanced the last decade. I think the current take is to try to avoid screens entirely the first two years.