Instead of sending 1 BTC at once, sending 0.1 BTC 10 times and setting the sats value to 30 (maybe lower) significantly reduces the total commission I will pay. Maybe I'm wrong, I'm just making this comment based on the estimated commission shown by trust wallet.
You're wrong. It could be your wallet selects the largest input first, that would explain why the fee goes up a lot when you send more. My advice: just send 0.1 Bitcoin now, and see from there.
Another advice: never sell everything! What if Bitcoin goes up 10-fold again the coming years? Sell some, but keep some too.
I want to send my entire balance with simple solutions without being too complicated. I think it would be reasonable for me to pay a total commission of $30-50.
Bitcoin transaction fees have nothing to do with "being reasonable". It's a free market, highest offer wins. Fees will probably go down at some point, but at the moment they're going up.
I recommend you to import your wallet into a software that supports RBF
That's dangerous advice. OP is holding quite a large amount, messing around with importing increases the risk.