DCA or Lump Sum?

Hey all,

I’m (26M) looking to max out my Roth IRA as I just got my bonus from work. I know the general rule of thumb is “time in the market beats timing the market” and usually (I think) lump summing your Roth is advised.

But with the market falling YTD would it be better to DCA to catch the potential fall and lower my average buy in or is the lump sum still the way to go?

My Roth consists of 80% VTI, 20% VXUS if that would change anything.