For me slowing my speech down helped a lot, sort of gave my brain tIme to catch up with what was coming out of my mouth. Substituting 'whatever' for many words missing, unable to be pronounced, or misplaced (say flooding for swimming ) became common phrase and 12 months post accident it can still sometimes happen. Miming has improved . . .

Whispering or singing can sometimes be easier than speaking; speech therapist saying this is not uncommon for stroke/brain injured folk.

Then there is fatigue - anything goes. Stress - even I wonder at the rearrangements!

Often time is a healer, best of.