When you want to express the idea of making a significant difference in something, you can use the synonyms that convey the same message as "improve considerably." Some of these synonyms include "enhance greatly," "boost significantly," "productive change," "radical growth," and "remarkable progress." All of these terms imply that the object in question is being changed in a very positive way. Other synonyms that could be used include "advance," "upgrade," "develop," "amplify," and "build on," among others. By using these synonyms, you can vary your language and add color to your writing, while still effectively conveying the same message of meaningful improvement.