Unclear speech for 5yo

Hi.. is anyone here having a same problem like me, I have been struggling with my boy have unclear speech and everytime he speak felt like not confident with low sound to speak coz he know he has not many new words to say. Im worried if this can cause self esteem in social skill. Actually He's not late speech type, he always speak n talkative. But he just have limit words. I think he has habit to repeating the same words in many speech. And actually my English is not so good. So sometime I feel so struggle to teach him Please help me some suggestions. Thnks. #speechdelay #unclearspeech #speechdelayforpreschool5yo