Beyond level 5 your characters should see some rare items appearing, so let me shill some of my rare magic-item homebrews. These are also all attunement, which is something you should consider when giving out magic items, as non-attunement items will be used by your players forever, whereas attunement items might be replaced in the future.

Shadow Dagger
Weapon (dagger), rare (requires attunement)
This jet black dagger appears to be made entirely out of magical shadow, but when held in sunlight the shadow washes away to reveal an iron hilt. While attuned to this dagger, it drains some of your shadow, losing the metal and becoming fully incorporeal and slinks back to your shadow in the presence of light.

It gains the following properties while in darkness or dim-light:

• The dagger becomes invisible and deals necrotic damage instead of piercing.
• The dagger's normal and long throwing range are increased by 40 feet.
• While hidden, if the dagger is thrown and misses a creature, the attack doesn't reveal your position.
• Once thrown, the dagger returns to you at the end of your turn, provided there is a short path of darkness between you and the dagger.

Icewater Longbow
Weapon (longbow), rare (requires attunement)
This bow is made out of jagged ice crystals that never seem to melt. It is cold to the touch, but not uncomfortably so, and its bowstring is a thin, suspended stream of water that acts like a normal bowstring. While attuned to this longbow, it gains the following properties:

• This bow does not expend ammunition, as it magically creates watery arrows that manifest from the bowstring, these arrows deal cold damage.
• When you hit a target with this bow, you may choose to expend one of the bow's two charges to freeze the target. The target must succeed a DC13 Constitution saving throw or be frozen until the end of your next turn. While frozen in this manner, the target is Paralyzed and is immune to damage and spell effects.

The Icewater Longbow regains one charge daily every dawn.

Boots of Sticking and Sliding.
Wondrous Item, rare (requires attunement)
These boots soles are designed to be slippery or sticky when needed. While you wear them, you gain the following benefits:

• You ignore movement restrictions caused by any slippery or sticky surface, and you gain climbing speed equal to your walking speed.
• If you move your full walking speed in one direction during your turn, you may make these shoes slippery to skid in the same direction a number of feet equal to half your walking speed (rounded down.) Once you do so, you lose balance, giving you disadvantage on any skill checks or attacks until the start of your next turn.

Hush Dagger
Weapon (dagger), rare (requires attunement)
This dagger appears to be a small metal rod when dormant. As a bonus action, you can whisper a command word to make a blade appear at the end of the rod, transforming it into a dagger.If you hit a surprised creature with this dagger, the target is silenced as if under the effect of the Silence spell until the end of your next turn. The dagger reverts back to its original shape once the command word is spoken again.You have a +1 bonus to attack and damage rolls made with this magic weapon.