2020 if anything like 2018, Trump is providing that inspiration. I doubt many Democrats will stay home taking the election for granted.
That is my hope. My fervor for third party candidates has evaporated under the pall of the last 3 years. Unlike many, I believe the Democratic field is full of genuine possibilities. None are perfect, the process certainly isn't, but "blue, no matter who" is the only logical choice this election. The risk to the country and the planet is too great otherwise.
My vote depends on whom the Democrats nominate. I know I won't be voting for Trump. Now rather my vote goes to the Democratic or to a third party candidate is solely based on who the Democratic nominee is. There's three or four I would hop on their bandwagon and support all the way, another two or three that would drive me to vote third party again. Against both Trump and whomever.
I think the ball is in the Democrat's court. Who they hand that ball to will probably determine whether they win in a landslide or if another 2016 is possible. I'm not a Democrat, so it's their decision. The key voting group is independents. Independents really, really disliked Hillary. They disliked Trump also, but not as much.