Bismillah,
Asalamu Alaykom,
Makruh actions will not cause one to have a sin, but it is possible that one could gain more reward by avoiding them. They are actions which are better to be avoided and disliked.
Furthermore although one will not get a sin for doing a makruh action, there could still be a negative impact for one spiritually. So by avoiding them it could build up one spiritually and strengthen their soul.
May Allah grant you success