Absolutely it can!
The Wand of the War Mage is an excellent example (212, DMG).
uncommon (+1), rare (+2) or very rare (+3)
Holding this magic wand, you get an attack attack bonus determined by the rarity of the wand. In addition, you ignore half of the cover when performing a spell attack.
Many elements already integrated into the game give Focus more power than a traditional Focus.
A Warlock (after using the Enhanced Pact feature of the Pact) and College of Swords Bard can both use their melee weapons to cast spells.
Clerics and paladins can use their shield as a spellcasting target.
All of these items can be magical in nature and potentially give an advantage to your casts and / or your attack / damage rolls.
Although each class can have a focus or weapon / target object, not all of them will give more powers to spells, but many will. If you are looking for something more specific, I recommend you browse the items currently created in 5E via D & D Beyond, or the basic rules books that you have at your disposal.