Hi. I think you’re conflating two things that don’t need to related. The first one, whether it’s sensible to combine pension pots is a question by itself. I combined mine (I had a few) last year and value the ability to see them in one place (I use PensionBee and have found them good). Separately, when is a good time to do this? Well, now’s as good a time as ever, there’s no saying when your pots will recover. You’ll be moving your money into a pot of your choice that has as much chance of regaining losses as the ones you are coming from.
I benefit from combining my pots as the management fee on the bigger pot is better than I was getting on my smaller pots. The visibility is worth a lot.
Finally, take care moving pensions around, depending on the type of pension you might lose out.