Hello [name]! Thanks for joining the GMC. Before making any posts in the Tech Support forum, can we suggest you read the forum rules? These are simple guidelines that we ask you to follow so that you can get the best help possible for your issue.
Increase your texture page size in the game settings to something larger than your largest sprite, or split the sprite into smaller sprites (or into subimages) and draw them together at run time. Sprites larger than the texture page size will be resized and suffer quality loss.