2024 / 2025 (hopefully) will be my first bull run and the majority of my crypto is currently on cold storage and I am wondering if I should get some ETH ready now to pay for fees when it comes to selling or if I should wait till next year when I actually do sell - is there any difference?...
Regardless of when you decide to sell your coins, you should always have a minimum amount of ETH in your wallet that will be sufficient to transfer or sell your altcoins. Therefore, you do not need to guess what the price of ETH will be in the future, and right now buy some Ethereum, I think 0.02 ETH will be enough.