>overall equips
probably make some wings at this point: if you can fight some frost giants (above ground snow biome during rain/snowstorm), they can drop an ice feather, which makes you a decent pair of wings. otherwise, souls of night/light can make you some, as well as a billion other things. check the wiki for more details on them, since there's too many to list. you will need to kill wyverns regardless, since they drop souls of flight. they spawn at very high altitudes, and can hurt early on.
putrid scent can be useful if you're in a corruption world, as it reduces enemy aggro.
obviously, the emblems from the wall of flesh can be useful: warrior, ranger, sorcerer for each class.
regular mimics drop some great stuff, such as philosopher's stones, which reduces hp potion cooldowns, and cross necklaces for more invulnerability frames
you say you only have spectre boots: combine that shit with an anklet of the wind and an aglet to get lightning boots, which make you go faster. combine the lightning boots with ice skates, and you have fully upgraded boots. might be a little harder since it's hardmode, but they're still pretty useful at this point.
>armor
you guys have adamantite, which kinda sucks since titanium, the alternative to adamantite, is way better. the only way to get that is through fishing crates, which can be tedious.
however, for melees and rangers, you can get frost armor by combining adamantite with frost cores (ice giants, mentioned earlier), which trades defense for offence, and gives you a burn effect on your weapons. it's not a direct upgrade, but more of a high risk/high reward alternative. mage will have to go adamantite (or titanium if he wants to fish for those crates).
i wouldn't recommend fighting bosses without max HP and adamantite/titanium/frost armor. break some more altars if there aren't enough ores in your world, but be wary of random hallow/evil spawns throughout the world.
cont