The easiest way, you can find them looking at your Activity page:
@Krelltimus you can see yesterday you finished this game:
lichess.org/TAA6BdcwYou can also find them looking at your correspondence games page:
lichess.org/@/Krelltimus/search?perf=4Or you can search them at your all games page:
lichess.org/@/Krelltimus/all the games appear orderer since when you started them, so for that game you have to scroll down to three months ago.