The rise to viability by a third party will take time and it will almost certainly be painful because the Democrats will mathematically be almost certain to take power during any such rise.
But you gotta start somewhere. Today's GOP is growing more liberal by the day and the party is largely spineless. They may talk differently from Democrats but here's reality: Under a GOP majority for years, the country has gone further into the clutches of political correctness and liberal idiocy. Under the current situation or anything like it, the best we can hope for is to slow the momentum of the liberal takeover of this society. That's unacceptable.
I'm sick of yielding on everything we stand for, one little compromise at a time. If there hadn't been people in the past willing to step out for a better way, we'd still have the exact two parties we started with a couple hundred years ago.
MM
As you say, it will take time. The only way a viable third party will arise, however, is if it is grown from the ground up, growing new support and organization as it goes along.
It must start at the local level. Get third party candidates onto local county boards, state legislatures, and US Congressional seats. Then you can go for the big prize.
There's no use in trying to get a third party candidate elected President if we can't get one elected as dogcatcher, though.
Until third parties recognize that fact, they are wasting everyones' time.