I agree. It's more about my forehand's timing and rhythm; everything else is solid. To give more context, the three tournaments I played were 5.0s and I felt like I was playing near open-level and now I'm back to being more solid 5.0.
Continue practicing or playing with the opponent styles you are comfortable with and I assume it is not hard to regain it. Being a 5.0 I think you should know that.
But you may also have to play the uncomfortable playing styles more often if the intent is to not break apart like that again in a tournament. In otherwords, you have a choice here since it is re-creational. Either avoid playing them completely or play them a lot more, or include them in your practice a lot more.