Interesting question. My first reaction is to think that we shouldn’t be ‘relying’ on anything temporal, and that we are to trust our heavenly Father in every way and for every thing. Where did I just mention this… ah:
Agency having just been mentioned in another thread, I do not think I can be thankful to something which does not have agency. I’m reminded of the song from Godspell, “All Good Gifts”.
We plow the fields and scatter the good seed on the land…
But it is fed and watered by God’s almighty hand…
He sends us snow in winter, the warmth to swell the grain…
The breezes and the sunshine, and soft refreshing rain…
All good gifts around us
Are sent from Heaven above
So thank the Lord, oh thank the Lord for all his love…
We thank thee then, O Father, for all things bright and good
The seedtime and the harvest, our life our health our food
No gifts have we to offer for all thy love imparts
But that which thou desirest, our humble thankful hearts!
All good gifts around us
Are sent from Heaven above…
So thank the Lord, oh thank the Lord for all his love…
I really wanna thank you Lord!

My main worry is that it could make me miserable, and I don’t want that.
I don’t want that for you either, or for any of us! It’s not easy to be thankful for everything, especially the hard things. In my experience, Christians are quick to cite 1 Thessalonians 5:18 (the two verses preceding it are okay too):
Give thanks IN all circumstances
That’s fairly easy, because you can pretty much always be thankful things aren’t worse. Like, whatever you’re dealing with, at least you’re not in Ukraine.
But this one is frequently overlooked:
…always giving thanks to God the Father for everything, in the name of our Lord Jesus Christ.
Ephesians 5:20
That’s not something you should trot out to someone who is in the midst of a trial though (and it’s hard enough for myself when I’m having difficulty in one way or another!)! I’m pretty much always thankful in retrospect (not always for things that I have said or done though!), even the hard things. (I’ve been struggling somewhat in how to encourage @adamjedgar whose wife is enduring chemo currently.) The One Thousand Gifts book I mentioned above starts out with her toddler sister being fatally injured after being run over in their farmyard when the author was only five. Oh, and the ‘dare’ in the subtitle was to herself first, to make a list. (And of course, that providence and ‘co-instance’ are involved didn’t hurt my feelings any. ; - )