Learning to Write Again (Is Really Freaking Hard) / Help

Okay, so I am making a somewhat comeback with writing, at least, I'm painstakingly attempting to. It's really hard because I'm in like a never ending period of mourning over lost notebooks. Let's discuss those.

1 Notebook #1 - I lost this back in 2014 after filling it up and then leaving it in my room somewhere after buying a new one. Such a stupid mistake. Always carry ALL writing with you, Amber. Gosh, what a fail. What an awful mistake. I can't believe I did that.
2. Notebook #2 - Blue Notebook - I remember flipping through this one like, at least six months ago. I have no idea what happened with it.
3. Notebook #3 - Black Drabble Notebook - This one was all around the house, I have no idea what happened to it, which is once again ridiculous.
4. Crashed Laptop - My Mac died a couple months ago and there went 99.9% of recent writing I did in the past four years.

So, see, all would be fine except...since losing these notebooks, my family and I kind of moved. I am pretty sure all three of those notebooks I had for years were left in a spare room. I meant to find them, and I kind of looked, but I never thoroughly looked for them because A. The room was a mess (moving and all, plus spare room) B. Er, I don't have a reason B.

Anyway, it was my fault. I should have kept better track of them. If this was me three years ago, I never would have had those notebooks out of my sight. Sigh. So, yeah, I am in a never-ending (I hope it ends) state of mourning over all the lost words. Even though they were all probably crappy, it doesn't help because that's like, my mind at work. Words conjured in my mind.

Sigh. It doesn't help matters that since losing Notebook #1, I started a book blog and kind of quit all serious writing. I haven't really written anything in years. I've written a couple poems here and there. I keep remembering pieces of past writing or at least vague ideas, so that's somewhat good.

I just don't know how to write about anything except "lost words" right now. Like it's literally all my mind is thinking of. It doesn't help that the above notebooks were all my idea notebooks. I do have some ideas in a document I luckily backed up.

Any advice on how to get over this? I keep trying to console myself with remembering that other people have lost writing and that the writing was probably crap (Meh, 'probably', ha), but it doesn't help. Mostly because it happened SO MANY TIMES and I never backed things up. :( This is why I should have typed everything up! Gosh. I never learn.

Okay, so, yes, advice for writing after years of not writing and losing a ton of writing?