GMAT - should i take the 4th time?

At this point, an extra 20 or 30 points is not worth it. I would focus on writing a killer application. Your score is good enough to get you in anywhere and a fourth time at 730/740 won't really change your application much.

No need to take it again.

As other experts stated- focus on other aspects of your profile like application writing. Often candidates overweigh GMAT score and under weigh the importance of essay. Make sure you balance the profile well and plan the things to utilize your time properly across different activities that play vital role in getting admission and your profile building.
GMAT alone won’t determine your chances of admission; academics, beyond the academics will and your work experience plays a vital role as well.
Generally most of the applicants have a good 4-5 years of work experience. Although it is not just the work experience that counts but also what you did there like-what were your achievements, what initiative you took, what changes you drove in your workplace etc. So to leverage this if you can show that in your years you have demonstrated the skills business schools are looking for you could put in a strong set of essays. Hence the quality of your work, your academics and beyond academics will play an important role in determining your candidature.
Good luck