Still not a good time to jump in??? - with the ups and downs

I posted yesterday seeking advice, as I’ve been gunshy after being burned back in ‘01 and ‘08.

If the goal is to be safe by buying VT or VOO, would your seasoned vets still advise being cautious and wait until it looks to have started the rebound?

I was planning on doing an initial buy to get my toes wet, but the swings every few minutes have got me paralyzed.

Is it possible that it could shoot back up in a day or so? Being day late and a dollar short is a cycle I want to break.