As expected, more transactions will happen in a bull market, and when there are many tokens under Ethereum that are being traded, there will be a network congestion then after that, gas fees will increase because many people are willing to pay more gas fees just to let their transaction to be a successful one
Most of your tokens are ERC-20? You're asking for a good way to prepare? Maybe a few months before the "expected" bull market starts, put the coins that you will sell in to different exchanges already. In that way, you will not wait for your transaction to be successful, and at the same time, you can sell your tokens immediately. The question is when do you think is the "expected" bull run?