The only solution to Yemen war is to subdue Houthi terrorists, confine them into a small area under tight control of Yemeni government.
Houthi terrorists may be able to launch missile or drone strikes at the moment but their capabilities are fast deteriorating.
The time is on the side of coalition/Saudis. They should keep destroying Houthis and their weapons stockpiles. Houthi terrorists will not be able to sustain that death and destruction for long.
Irani terrorists will not be able to directly help their terrorist proxies in Yemen either. What these terrorists can do at the maximum is activate their other terrorists proxies in Iraq to fire missiles/drones on Saudi Arabia.
It's also quite possible that IRGC terrorists cross over into Iraq, fire some missiles/drones onto Saudi targets and then quickly run back like coward rats.
All these cowardly Iranian tactics will not be able to save Houthi terrorists in any case.