You would have to coinjoin or mix your coins to again gain an advantage in the privacy race before you use the change from one transaction for a different one to a different party or use case. Adding the coins to a lightning channel is another solution to mask the history of your coins.
The privacy generated by using Submarine Swaps is a smart idea, but their primary purpose was to allow Lightning channels to be refilled via (on-chain) (off-chain) transactions, but since the transaction is a Hash Time Locked Contract (HTLC), the option of pumping fees using RBF And CPFP leads to replacing the secret with a new transaction, which makes it bad to use in the case of high Bitcoin fees, as you can wait for weeks before confirming the transaction, or you will always pay higher fees.