Yes, there are many tools available to convert your OST to PST format. Mostly the software is paid, and among the paid software there are few which are credible.
I would recommend you to use a professional software application like Stellar Converter for OST. Exchange and outlook experts highly recommend the software. Since I also used it, I can say that it is quite useful. No prior technical knowledge is required to use this one, and you need to follow few simple steps to get the job done.
It converts your corrupt or orphaned OST file into PST file format and provides you with great features as well.
More info: https://www.stellarinfo.com/convert-ost-to-pst.php