Life would be so much more exciting if you would branch out into the use of synonyms, words that mean the same but are different. The thesaurus can be an intellectually stimulating companion. Buy a vocabulary book. There are many available at bookstores or on the Internet. These books take you through a process to build a vocabulary.
Many people prefer the books that use root words as a guide.
In some ways, this may be similar to studying Latin, but don't let that scare you off. By learning root words, you can determine the meaning of virtually any new word. Each person must look up the new word, define it, talk about its root and use it at the table. Keep a running log of these words and use them regularly. Stop, look and listen when reading books.