My take: comparing your results to anyone else's is a losing game — that is the bit I would tell anyone signing up today. Are there any truly free dating sites that don't throttle your profile visibility? Expecting any single conversation to work out is the wrong frame — happy to be argued with on that one.
For what it is worth, most quiet inboxes are a bio problem rather than a photo problem — it sounds obvious written down, but it took a while to land.
Honestly, the first line of a bio does most of the work — that has been consistent for me across a few different platforms.
From my side, taking a break when it starts to feel like admin is sensible — nobody tells you this at the start.