For a file named To.Be.Or.Not.To.Be.1983.1080p.BluRay.x264 , you should look for .srt files specifically synced for the "1080p BluRay" or "YTS" releases.
For independent subtitle files, you can search reputable community-driven platforms: OpenSubtitles Addic7ed (often better for TV, but has movie catalogs) To Be or Not to Be (1942) - The Criterion Collection subtitle To.Be.Or.Not.To.Be.1983.1080p.BluRay.x...
Official BluRay releases, such as the one from Criterion , typically include English SDH (Subtitles for the Deaf and Hard-of-Hearing) . For a file named To