What is the difficult part in creating a decentralized platform that exchange between different cryptocurrency blockchains? or at least similar blockchain such as Bitcoin hard forks.

My question is what is the hardest part. We already have the ability to decentralize between tokens of the same blockchain.

Why is Gemini launching such rumors? glassnode clarification that is not true.
It's the second time it's happened in the last 30 days
 


https://studio.glassnode.com/metrics?a=BTC&category=&chartStyle=column&e=gemini&m=distribution.BalanceExchanges&mScl=lin&pScl=log&resolution=1h&s=1613212524&u=1615804524&zoom=30

you have got technical answers. I will give you some tips:

When fees are low consolidate your small inputs, it will reduce the number of inputs and you will pay lower fees. https://bitcointalk.org/index.php?topic=2848987.0
Historically the fees are low on Sunday if you can send payment at any time try to check fee every Sunday.
use coinb.in/#fees to know how much fees for next block.
use bc1 addresses