I was wondering how much you are using your Steam Deck? And did the games you play on it change since you bought it?
I find that I used it a lot when I first got it, but my usage has gone down in the mean time. That’s mostly because I play games that are not a great fit for the Steam Deck (strategy, building, etc.) and I prefer to play those on my PC.
I have the 512GB LCD model and recently put in a 1.5TB SD card and am loving being able to install bigger games. So far I haven’t noticed any real lag vs it being installed on the internal SSD. That may be an option for you.
When funds allow I will be upgrading my internal SSD to a 2TB, but, for now, the SD card works fine