In VLC, to make subs larger: Ctrl +P, bottom left click All (to see all settings), scroll down to go to video/(subtitles/OSB), click tiny triangle arrow to open cascade list, click Text renderer, on right side increase Font size in pixels to 50 (suggested) or which ever size you prefer.
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Musfiqeon (uploader)
leosmileyface
Musfiqeon (uploader)
Quackas