The easy onsets (going into the word with an audible, breathy "H" sound) can help, especially with blocks (aren't blocks the worst?) I have to say that I typically do what u/Budget_Dust9980 mentioned and start a sentence with some sort of sound to help 'flow' into a sentence. It's technically not one of those "strategies" that speech therapists will teach, but I've always thought that as the people who actually stutter, the strategies that we come up with can be just as good if not better. Another thing that might help as a somewhat last resort is to change the sound with something similar. Off the top of my head I am thinking changing the 'R' sound with a 'W' sound. So instead of "Rain" you'd say "Wane." Yeah, it's kinda duh, and half the time it doesn't work because you're making the same mouth movement as the 'r' that you're blocking on. But if you're like me, who looks like they are about to have a seizure when they block, I'd much rather make a word that sounded silly vs the alternative.