Unquestionable Evidence That You Need Item Upgrade
WoW Upgrades - The Item Upgrader
Upgrades will give you a boost to specific stats. Each upgrade increases item level by +3. Each upgrade also boosts the random substatus.
upgrade item upgraded gear is usually more valuable, unless it has a low requirement by nature (like FB sorc shields) or has a high variance in stats (like eth Titan weapons). These types of gear get less value from upgrading due to the need to roll for a perfect model.
Recycle Points
The item upgrader allows players to upgrade gear to a higher level by supplying the appropriate currency to the NPC. Upgrades can be applied to any type of armor or weapon. However, the item that is used to upgrade will remain in use for a long time and cannot be used again. Upgrades can be used to create the enchantments.

You can upgrade your equipment anytime by visiting the upgrader in any major city. To keep your gear current, it is recommended that you visit the upgrader every couple of weeks.
Upgrades will cost more depending on the level of the item however they'll always be cheaper than buying new equipment. Upgrades such as upgrading a Benthic chest to the level of ilvl385 will cost you 20 recycle points. Buying a similar item will cost you 105.
Valorstones
Upgrades are items that can be used to upgrade weapons, armor, tools and accessory upgrades. They can be bought by players from item upgrader NPCs in exchange for a variety of currencies, and can be found in random treasure lists. Once purchased, an upgrade is able to be used on any weapon, tool, or armor. The button will show the preview of an item's next upgrade level if there are enough materials.
The cost of upgrading is based on the slot of the item and the current item level and the weapon's price is higher than gloves or bracers for example. Each upgrade costs 15 Flightstones and a few crests, with some upgrades having a discount to lower the cost of the Flightstones or the crests used. After an item has been upgraded to a certain degree it is able to be downgraded and sold to the upgrader at a lower price.
Upgraders for items can be found at many locations on the main island as well as some outposts. The NPCs provide both an upgrade coupon and the possibility of obtaining a new recipe. The discount for upgrades increases according to the number of items being upgraded. It is also possible to be boosted by requiring players to complete specific achievements or complete quests.
In contrast to Cromwell in Baldur's Gate II is no upgrader for items at the beginning of Icewind Dale. Instead the NPCs that are available to help with upgrades are acquired via several methods which is both an improvement but also a drawback.
In Season 3 the upgrade system has been altered a bit, with some new features added. After a player has earned an upgrade to a particular level of an item for a specific armor slot, upgrading other items to that level will cost less even if they belong to an entirely different set of gear.
The discount applies to all accounts. The amount of Harbinger Crests required to upgrade is cut also, but is only available when certain milestones are achieved.
Crests
When it comes to upgrading equipment in WoW, players have a variety of choices. Flightstones are an option that is accessible to everyone who wants to upgrade. Crests are more special, and are used during specific upgrades to the level of an item. Crests are the main component of the Dragonflight gear progression system, which was introduced in 10.1, and come in 4 ranks.
The first thing to remember is that the crests can only be purchased for equipment with a certain rank. Each rank comes with an upgrade path that is different. The simplest and simplest upgrade costs 15 crests. The most complex upgrade requires up to 20 crests, contingent on the kind of equipment that is being upgraded.
Players can earn crests by working through content that is of the appropriate level, which means walking around and doing outdoor activities for gear of lower tiers, dungeons or raids of all difficulty for items of higher tier or Mythic+ dungeons or heroic raid bosses to obtain endgame gear. These crests can be exchanged with an item upgrader such as Cuzolth or Vaskarn, in Valdrakken for the appropriate upgrade steps and pathways.
The use of these currencies isn't that difficult, but the system does introduce some changes to the overall upgrade process. When a piece has reached the highest level of upgrade for any rank (Explorer or Adventurer) it is no longer required to purchase Flightstones. This change is designed to allow players to upgrade their gear up to the highest level possible on all their characters, instead of relying only on seasonal loot.
It's also essential to use crests wisely, as they only have one use. It is recommended to use your Whelpling-rank Crests on the top-quality equipment you can find, and keep Drake and Wyrm Crests to be used for the next set of upgrades. This is particularly relevant for items like trinkets and rings that fill several slots. The discount on the account will only be applicable if all the slots on the character are filled with high-quality gear.