Tips to Alleviate Hand Soreness
The solutions many people try for hand soreness include:


Padded gloves
Padded bar tape/gel inserts under the bar tape
Raising the bars, either by moving the stem up if you have spacers above it, flipping over an angled stem or getting a new stem.
Tilting the saddle backwards so that the hands aren't having push on the bars to counter you sliding forwards.
Getting a professional bike fit.