ꉂ🤣𐤔 I've had that same problem, but my data didn't swell that big.
You can just delete the app then re-install it, since cache deletion may not work well. (Make sure you have your nsec in the key-chain beforehand.)
@note1ls78zxk56sgr9f6vy2tvy0urdya26uxnm53q4lncxh2t8qr0yffsqetjsh
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apparently you can avoid the reinstalling, and just go to settings -> appearance -> clear cache 💜
I tried it but reduced like 500MB only... The same thing happened on my friends phone, too.
It was not too much work so it's OK anyway.