I actually also have a super active Holland lop and I’m planning to get him a friend after he is neutered! Our story is very similar Lilli!
And I agree with sarahthegemini. She is right when she says all rabbits have to be fixed before bonding. Even though one of the rabbits will already be spayed/neutered, it is still important to spay/neuter the other one as well. This decreases humping fighting and other harmful things, even though some humping may occur if they’re both fixed. And you definitely want to fix your current rabbit or else you will end up with babies!
The rabbit friend I’m getting for my Holland lop is already spayed because I have a local shelter that has rabbits. You also want to make sure that the rabbit you get, is the opposite gender than the one you currently have. I’m not saying you can’t have a male/male or a female/female but it is recommended to have a female/ male. Opposite genders tend to get along better than the same genders.
Lastly, if the new rabbit you get is too young to be spayed/neutered, I’d keep it in a separate cage than your current rabbit until it gets fixed. In the meantime, you can even do some pre-bonding which can be switching each others litterboxes, switching cages, (etc.)