Grounding oneself whilst everything else flies away...

Venues are promised and then disappear. Or might disappear. This year for some reason, I know that I will make plans and those plans will dramatically change... it is inevitable..pushing ones head above the parapet, doing a financially risky show... so to anchor myself, I'm gonna concentrate some time on singing. For Edinburgh, I am intending on singing 2 shows a day for 20 days, with a few days off along the way. How do I keep my voice strong...? First up an exercise called messa di voce... long notes , no tension in the throat, crescendo in the middle.