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I was wondering if there is a way for a warlock to consistently use enlarge/reduce (or any other second level spell that is not a warlock spell) without multiclassing. I was looking around but could only find ways to learn cantrips and first-level spells from other classes.
I am looking for a way to cast:
There are no official ways to gain enlarge/reduce as a generic warlock as of 7-20-2018 without magic items, but Duergar (found in the Sword Coast Adventurer's Guide) gain it as a racial trait:
Duergar Magic
When you reach 3rd level, you can cast the enlarge/reduce spell on yourself once with this trait, using only the spell’s enlarge option.
You can only use it once before a long rest and only for the enlarge option on yourself. For only official ways, though, this is what you've got.
One of the many, many benefits of attuning a Staff of the Magi is:
You can also use an action to cast one of the following spells from the staff without using any charges: arcane lock, detect magic, enlarge/reduce, light, mage hand, or protection from evil and good.
This has no limitation and can be used as much as you like. The staff is attuneable by warlocks, but you should be aware it is a Legendary magic item, and thus not something trivially acquired, even with dedication.
As an aside, there is one in Tales From the Yawning Portal's Tomb of Horrors conversion. Good luck getting it out in working order and with the party alive, though
Outside of the existing Eldritch Invocations (i.e. Whispers of the Grave allows you to cast speak with dead at will), there are otherwise no way to get a spell from another list.
To list some things that won't help you:
Bards can with Magical Secrets, but Bards are not Warlocks, so this isn't going to work for you.
There is the Magic Initiate feat, but it only gives you access to a 1st level spell and cantrips.
Certain races can also cast spells innately (such as Duergar, which can cast enlarge/reduce innately).
However, both of these last two are "once per long rest" (as are many of the Eldritch Invocations, incidentally, such as Sculptor of Flesh, as an example) so does not meet your "consistently" requirement (since I would say "once per long rest" counts as being a "single use solution", as you put it).
So unfortunately I think either multiclassing or simply not having the spell are your only options.
Though what I have in mind is in no way efficient in my opinion.
An answer to another question here is talking about paid services for spells cast by NPCs.
With that in mind, if you can get your hand on an Ioun Stone (Reserve), you can get an NPC to cast Enlarge/Reduce on the stone and keep it until you need it. Note that the stone can only hold one casting of the spell since it's a level 2 spell.
