Only trolls insist it is "difficult", to suit their agenda.
All this has been explained to you numerous times. Your trolling is no more welcome this time than any dozen previous times.
And what simple technical measure mitigates it in a cost effective manner? Hydroelectricity is one, but it's geographically dependent. Sweden already has about 30% of it's electricity coming from dams, but it still needs to built more nuclear plants to fulfill it's demand. And most countries have even less hydroelectric generation than Sweden.
Besides hydroelectricity, there's batteries which are not able to be built at scale. Then there's experimental solutions like compressed air, chemical storage, or giant flywheels. But none of those have been deployed commercially and thus there's no real-world cost history.
Proclaiming that the solution is simple, yet neglecting to actually specify it is not an effective way to make the case for storage. If you want to make the case for a plan to provision storage, make it and we can discuss that. But apparently, the solution is apparently so simple it defies explanation. How convenient!
Well in that case: we don't need fission, renewables, or storage. I know of a fusion breakthrough that will make electricity to cheap to meter! And it's so obvious I don't need to explain how it works, and anyone who doubts me is a troll.