Hello and welcome to the community forum, @Ishrat Jahan!!
We do not suggest you to upgrade directly from 3.6 to 5.0 as there might be a great difference in the features and enhancements between the versions. Please refer to the following documentation here which explains the same.
Therefore, the recommended and tested in-place method is to upgrade the MongoDB version by upgrading sequentially. Hence, for you the upgrade sequence would be 3.6 → 4.0 → 4.2 → 4.4 → 5.0.
The reason why we suggest a step wise upgrade is because each major version is released with new features or enhancements of the legacy features. Hence to maintain the data integrity, the step wise upgrade is recommended. Please refer to the following documentation Upgrade to 5.0 to read more on the same.
In addition, we have a related discussion on a similar topic MongoDB community that you might want to take a look for further information/documentation.
Please do let us know if you have any concerns.
Thanks
Aasawari