Same here, my littler girl is 2 at the end of March and as a whole she can only say about 4 words, she has previously said words such as ‘outside’ ‘pizza’ and ‘cat’ but has never said them again! She also doesn’t go to nursery, and like you said I also explain things and make some words more obvious when speaking. But I guess all babies are different and I wouldn’t worry too much about it!
My youngest was well over 2 before his speech improved he's 3 in April and still has enunciation problems when his brother was fluent and said everything correctly at his age. So he had 2 speaking influences sometimes it just takes them longer. He was also completely mute at nursery and super talkative at home so nursery doesn't always aid in speech. Just keep talking to him normally, if he says something in his own language always reinforce it with the correct word and he'll get there .
Mine is the same mainly gibberish but definitely starting to say more words and understands us. They pick up the last word better that the other words so try and shorten the sentences for them if that makes sense x