Hi, I don't really have advice, but just wanted to say that we are in the same situation here! A 2.5 month old and an 18.5 month old. The 18 month old is SUPER busy... And now that mom is busy with baby sometimes, he has lots of opportunity to get into things. I feel like I run around from mess to mess sometimes.
We had the "danger" cupboards and drawers all child proofed previously, but now on the urgent todo list is childproofing ALL cupboards and drawers, because even if the things won't hurt him, it's kind of tiring having to constantly put things away if you leave the room for 1 minute.
As we are out and about, everyone likes to engage in conversation about how busy I must be - and it's true lol. A few older women seeing me have said they also had babies very close together - and it was a lot of work, but as their children got older, the gift of a close sibling was so worth it.