I get that but I wouldn’t know any such way. There are dedicated subtitle tools that can sync audio and text but those need the files. Failing that you can only do it by ear.

If the subtitle file was downloaded from opensubtitles automatically, there’s also the very real possibility that it’s the wrong file. It might be the correct movie but the subtitles might be synced to a different framerate and there’d be no way for you to know.