The decline of trust in government will mean that some of their policies, like raising taxes or general fiscal progressivism, will be less emphasized. They will probably lean in to popular secular beliefs, particularly on abortion and perhaps also on LGBT issues; more speculatively, on drug legalization and perhaps sex-work associated issues. Since they will be trying to keep support from people with high social trust, one exception to the general decline in economic leftism will be continued strong support for unions (though this may not be super relevant), and also the most classic cross-cultural high-trust party positioning: becoming the party of the military. (2032 may be kind of early for this -- although maybe not -- but I really do expect Democrats to maintain relevance by going in a militaristic and interventionist angle over the next few decades.)
Do Republicans go (relatively) to the left on economics in this scenario? Like paid maternity leave laws passing in red states? Maybe some flirting with UBI in declining manufacturing areas? There are now some elected R's making "the corporations are out to get you" a significant part of their platform, which is new. A significant factor in this would be that their base demographic is transitioning from peak earning years to retirement, which would make supporting Medicare and Social Security at current benefits levels or higher seem pretty darn important.
That, plus what you are saying about Democrats all seemed likely to me back in 2016-17, but then Republicans strongly took the libertarian position on COVID and Biden ran as more of a traditional New Deal Dem on economics than Clinton and improved pretty dramatically with seniors. On the other hand, COVID will (God willing) be completely irrelevant in elections held 10 years from now. Abortion will cut the other way though and could give Dems another chance with libertarians.
Another significant factor will be whether we eventually see a grand bargain on climate change. Republicans are about to be completely dependent on Florida to win presidential elections after all.