I have recently become interested in cross-platform application development. I'd like to know whether it's worth it to do it myself or is it better to entrust the development to professionals? If the second, please advise me where to go to get a quality result?

Of course, it is better to entrust the development to professionals. In this case, you should look for companies or freelancers with experience working on cross-platform projects. Pay attention to their portfolios and client reviews. Some popular platforms for finding developers include Upwork, Freelancer, as well as specialized forums and communities of programmers. The main thing is to clearly state your requirements and budget to find the right contractor. I recommend this cross-platform app development https://pharosproduction.com/mobile-app-development