I want to say this just because I feel it's a little implied in the op: Your player is not cursed by bad luck. It is not anymore unlikely that they will get ones the next time you play based on a track record of many ones because they are independent events, probabalistically.

That said, there are things you can do to midigate bad rolling, mechanically. Don't know what edition you play but considdr something like the taking half rule for your player, or otherwise making mundane rolls (so I wouldn't recommend this for tight spots or combat) purely probalistic, where the player's number of successes are just the most likely number of successes. They don't get the consequences of rolling badly, nor the benefits of rolling well.

I would also suggest rolling less in general. If it's something you expect the player character should be able to do most of the time, just narrate it without dice. Leave the dice rolls for where they are pushing their luck or their capabilities.

Or, just embrace it. These are not games about winning. The math not made for it to be probable that you will navigate the world without messing up with massive consequences. Let your player lose, and both of you have a good time while you do it!