Synthesizing some of the stuff that's been discussed here...
When you're losing, something's got to change. One thing to try is changing strategy - finding a better strategy that'll help you win. Try being more or less aggressive, try changing spins or directions or coming to net more or less.
But sometimes, the strategy's fine and changing it won't help - you just need to execute better (or for your opponent to execute worse). To execute better yourself, common approaches are to either get yourself to hit more shots, to get in a rhythm - i.e. extend the rallies. This could work even if tactically there's no particular reason for longer rallies to help you - the goal would be to have longer rallies to get some rhythm back and to start timing the ball better, but maybe then shorten them again once you're hitting your shots better. Or, extend the time in between points to try and improve your focus - deep breaths, don't rush, etc.
Or vice versa, those both also give opportunities for your opponent to cool down. If they're timing the ball great, maybe making them hit a few more shots will wear them out some, or give them a chance to mistime some shots or think about the score too much. Maybe giving them a bit more time to think will let some adrenaline wear off, or for them to start overthinking.
On their own, both of those are just "losing slower", since it's not like they're going to win you more points on their own. But they could be ways to get your rhythm back (and thus win more points later, and hopefully turn the match aroudn.)
...hmm, could sense to me. If you're losing, you want to slow things down - gives yourself more time to focus, the opponent enough time to overthink - and hit more balls, since it gives a chance for you to find a rhythm or for your opponent to lose it.
And I guess if you're winning and hitting well, the opposite is good - no need to get into extended grinding rallies (unless that's how you got ahead in the first place), don't give your opponent a chance to get their rhythm back. Don't interrupt your rhythm or slow down, keep the good shots flowing. Finish the match before your opponent has a chance to fix their execution or disrupt yours.
I suppose there's a judgement call there. If you're losing, do you need to figure out a different strategy, or do you need to figure out a way to improve your execution? If the problem is that you're just not timing your shots well, then trying different strategies is just going to make you spray a bunch of errors and lose quick. On the other hand, if your execution is fine but your strategy is bad, trying to slow the game down to fix the execution will just make you keep losing, just losing while tiring yourself out more and wasting time.