It might not be enough to get an arrest warrant, but it could be enough for a search warrant.
Find out the ISP that owns the address, ask the ISP what customer it was assigned to at the time in question, and while that doesn't tell you who was using it for the particular accesses you are investigating (it could be anyone in the house at the time, or someone outside using that house's WiFi, or someone from anywhere in the world using malware installed on a computer in the house), it does tell you that that house has a decent chance of having relevant evidence, and that will probably be enough to get a warrant to go look for that evidence.
Find out the ISP that owns the address, ask the ISP what customer it was assigned to at the time in question, and while that doesn't tell you who was using it for the particular accesses you are investigating (it could be anyone in the house at the time, or someone outside using that house's WiFi, or someone from anywhere in the world using malware installed on a computer in the house), it does tell you that that house has a decent chance of having relevant evidence, and that will probably be enough to get a warrant to go look for that evidence.