Probably the cheapest and best option is to build more wind and not care too much if it increases curtailment.
Yes, all the things mentioned should be looked into and done when it makes financial sense but "wasting wind" is much less a thing to worry about than "burning gas", and I'd rather waste wind than waste money.
*also where you are would be interesting. There's a big difference say between Scotland and Croatia.
But seriously (author of article here) I think that agile tariffs and more demand flexibility are probably a big part of the solution
Edit: for those who are curious, here is some data on prices over the last month: https://agileprices.co.uk/