Yes, I think SSM is likely the best bet. The decision would look similar to the recent one whereby the decisions are left to the states.
If there were ever such an event, it would likely play out the same way as Dobbs: a jurisdiction enacts a ban, someone argues it as unconstitutional (with Obergefell, it was because Ohio refused to recognize Jim Obergefell as a surviving "spouse" of a terminally ill man) and somehow somewhere, it makes it to the Supreme Court and it is ruled that there is no constitutional right, immediately left back to the states.
Evan if some states kept it legal, there would be enough states with it illegal that the pressure would be off so we could openly promote God's laws without being charged with a hate crime.
But most importantly, we would be more free to convince others.
We have to look at the bright side and keep pushing to regain more ground and not lose any we've gained.