As Leinfors stated any upcoming changes will more likely than not be changes related to the 1.4.1 changelog, I divided my suggestions into 3 subsections. I entirely understand that the 2nd or 3rd sections are unlikely, so no need to point it out. I tried to include changes that aren't too big.
1. Direct changes to 1.4.1 changes
Daybreak
Increased trajectory length - such that it's useful vs offscreen Moon Lord
Blood Thorn
Make the thorns also appear on platforms
Unholy Trident
Increase the size of its projectile
2. Additional changes
Wearing a Mining Helmet, without a full mining set, increases the spawnrate of Undead Miners. (Similar to how gem robes increase Tims spawnrate)
Diving Gear
Increased drop rate - the only time i get this item is when i go out of my way to farm for it, which is almost never. If it's dropped more often it increases its viability and that of its tinkers.
Fairy Boots
Material for Lightning Boots
Blowgun
Reduce use time as well (similar to Blowpipe).
Why not buff the Aeriel Bane together with the rest of the Betsy weapons? I think it's rather niche and underused.
3. Changes unrelated to the 1.4.1 changelog
Obsidian Water Walking Boots, Molten Charm
Replace the Obsidain Skull in its recipe with the Obsidian Horseshoe and give all tinkers additional fall damage negation. (Obsidian horeshow will finally be useful and some Boots will have fall damage negation)
Honey Balloon
Add a recipe for the Bundle of Balloons that replaces the Sandstorm in a Balloon with the Honey Balloon. (finally makes this accessory useful + no need to have a Sandstorm in a Bottle in your world, but you are locked to post-Queen Bee to get the Bundle)
Give the Putrid Scent and Flesh Knuckles the Panic Necklace/Band of Starpower treatment.
Gravity Globe
Dropped by the Lunatic Cultist in Expert Mode, Moon Lord already has the Celestial Starboard and Suspicious Looking Tentacle.
Bananarangs
Increased drop rate
Monk's Belt + Squire's Shield + Huntress's Buckler + Apprentice's Scarf / Celestial Shell + Celestial Stone
They don't stack with each other, yet you can still equip multiples. Make it so you can only equip one of them at a time, similar to how you can't equip multiple wings.
Change all instances of "minion damage" to "summon damage", since whips and sentries also benefit from so called "minion damage".
Tax Collector gives you more money
The more the game progresses, similar to how the Nurse charges her prices.
Journey mode duplication menu
I often times don't click "enter" after searching for an item, this results in me taking an item, after which i attempt to move but i end up typing gibberish in the search menu. After taking an item from the duplication menu, can you prevent us from typing? I know it's useful for when you're duplicating multiple items at once, but most of the time I'm looking to duplicate 1 item. Maybe add another setting for this?
Make a unique interaction for the Rocket Boots (and tinkers) + Soaring Insignia combo, for example rocket boots accelerate faster. Such that Boots become a viable option other than wings in the endgame. The way it is right now, the Rocket Boots + Soaring Insignia combo is pretty slow and outclassed by many wings.