Time management is a problem for most people on the DI section, so you are definitely not alone in this. And guessing will almost never give you the correct answer on DI because of the nature of the questions - most questions contain 3 sub parts or require two answers (TPA) and you would have to be really lucky to guess both or all 3 correctly. In fact, the only DI question type where intelligent guessing can work to some extent is DS.
So how do you go faster? First, analyse your tests/error logs to see if there are specific question types on which you are taking too much time. MSR often gets the blame (mostly unfairly), but I have found the real culprits to be DS and TPA. Then you need to revisit your strategy for those question types.
One common trick employed by the test makers is to provide a lot of superfluous information in the question prompt. I keep telling students that a key skill you want to develop on DI is the ability to separate signal from noise. Easier said than done, but definitely possible if you go in to questions knowing that you don't necessarily need to make use of all the information that is given to you.
It wouldn't be a bad idea to watch some videos by experts you trust or better still, spend an hour or two with a good private tutor running over your mistakes and your approach to DI questions. What you don't want to be doing is an endless stream of questions because you'll simply keep repeating the same mistakes. Feel free to reach out if you have any questions.