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?

I do not hold Ethereum but do have a few tokens that will require me to pay fees so wondering what is best to do have it ready now or if it doesn't matter and just wait till it actually comes to selling and pay then but obviously the price of Ethereum will be a lot higher next year then it is now so thinking is it best to buy now whilst cheaper?