As others have said, there is definitely no rush to "having" to celebrate the holidays.
I'll be married 9 years this summer to my non JW hubby. I stopped going to meetings when I got married. The first 2-3 years we didn't celebrate the holidays except for birthdays. And come on, JW"s will do anniversaries but not birthdays??...that was an easy one for me to start with.
Then I moved on to making a Thanksgiving dinner each year. Even invite my JW parents to it and they come!
Then my son was born 4 years ago and that was my entry into the holidays! Started with 4th of July, then Halloween, then Christmas although I JUST had my first tree this past year, so 8 years after I stopped attending is when I went all in with the whole celebration and decorating.
We skip doing Easter. Other than that what is left? President's Day, Memorial Day?
So you have Thanksgiving, Halloween, Christmas and Easter. T-day is easy to pass off as a family day, Halloween - lots of people skip that one, not unusual and these days schools have become very generic in their holiday crafts and celebrations, Christmas - again, easy enough to have a family celebration if that is what is desired, but the kiddos some presents and let them return to school with the news of the presents they received "while on break", and Easter- always happens on a Sunday, so nobody knows if you do or not!
As for raising kids with morals...from what I've learned, they don't get that from the bible...it's whatever the parents teach them. In my experience, my 3 good friends are amazingly moral/ethical/good human beings,moreso than many of the witnesses I have known in my life.
Now that I am out of that life, I experience a whole different way of raising children. It's not all focused on keeping them quiet at meetings and dressing them up in little suits and dresses 3 times a week. When you aren't focused on all that garbage it's amazing how much time you have to actually get to know your child, talk to them about things, help them think through situations without it always being "do you think that will make Jehovah happy?"
I actually admire the parenting techniques of my friends instead of learning, oh I guess I should be beating my 2 year old in the bathroom because he won't sit still for 2 hours.
It can be a slow process for some, great recommendations from previous posters about finding and making the focus on family events.