There's not many available that would be guaranteed to improve much. Only two fullbacks in the league has created more big chances than Dalot this season (unsurprisingly, Pedro Porro and Reece James). He has also scored 1 goal and 3 assists.
I get the frustrations with Dalot, and he is one of the most annoying players in the squad in terms of decision making at times, but the fact is that he is a solid, all around right back, and the idea that we can easily get another right back that will contribute equally as much as him - both offensively and defensively - is way off. This is more about replacing him because fans don't like him and want something new, but we've been doing this so many times with other players, and it almost always backfires.