If you see Elon musk saying about bitcoin for sure he's not going to lie about that for sure, but we need to see the recovery process that's going to happen in 2023 before next year where the bitcoin halving, so people are definitely going to put a lot of money this year into crypto , so trust to buy it in this year stock more bitcoin or other crypto eg dogecoin as support also for elon musk 
I also wish what Elon Musk said would come true, but if I had to stock up on other cryptocurrencies besides more Bitcoin, I wouldn't choose Dogecoin for this or this year. Because I don't feel the need to support Elon Musk by buying Dogecoin, but I prefer to buy other cryptocurrencies like Ethereum or BNB or Matic for example. And this doesn't mean I don't like Dogecoin or Elon Musk. But I just have more faith in everything else and Bitcoin in general.