Find a magazine or your favorite novel, or a textbook or newspaper. Find your favorite article and read aloud 1~2 every day.
Search for tongue twisters online, print them out yourself, or save them in your mobile phone to find some classic and difficult tongue twisters. You can start with short ones, such as "Eight hundred pacesetters running north slope" and "Dumb Lama", and practice each tongue twister about ten times a day. When practicing, you should enunciate clearly and not jump, so that you can consciously speak faster and faster.
After practicing basic tongue twisters, you can connect some advanced tongue twisters, such as Linglong Tower, the name of a vegetable newspaper. These can be practiced part by part, and finally they can be practiced together until they are done in one go, without pause and unclear pronunciation.
Insist on watching the news every day. Bian Xiao used to watch Issues of Common Concern. He goes to that spot every day to watch the live news. At this time, you can watch the scrolling subtitles below and try to be the anchor yourself. Repeat the news loudly and clearly. Of course, you can also repeat what the anchor has read to improve your language sense and accuracy.
Communicate with friends and classmates who are good at Putonghua, and practice makes you know. Practice can test the effect of learning. Be more open-minded and relaxed, and persist for several months.