>>720508609
there are a perfect amount to fully upgrade every crest
if you are worried about "wasting" crests just avoid upgrading hunter, beast, witch, or shaman. not that any of these are bad crests (except for maybe beast) they are just generally more difficult and niche to use for most people hunter gets 2 upgrades later and becomes quite good
if you already used lockets on anything do not feel bad. they end up being very plentiful and there is even an NPC that gives you upgrades which requires you to use your memory lockets so you will eventually be dumping lockets into crests you never intend to use anyways
if you are still early game and just want guidance id highly suggest picking up the wanderer's crest and fully upgrading it. its imo the most straightforward to use and you can easily use it the entire game