Practice riding in the drops, i.e. on every ride every so often try to spend 5:00 in the drops, then work up to 10 then 15 min etc. When you can comfortably do that for periods at a time, try lowering the bars a spacer or 2. You can also try bending elbows and getting low on the hoods like the pros do:
Want to ride faster? Hunker down on the hoods, say researchers | road.cc

Work on core strength and flexibility and/or bike fit if you can't do above. Assess your equipment and clothing like jeff@work mentions. Better wheels, with deeper rim and bladed spokes can give you marginal improvement.

I used to hate the wind but by riding on windy days and getting beat down by it time and again and working on above has done wonders for morale and made it more tolerable.