Imo, dogecoin are good only for short term investment and not for a huge amount (to prevent funds freezing for a long period). Buy some dogecoin, wait until Elon Musk make something extraordinary towards dogecoin and its prices rises, sell dogecoin, buy again in few months. Repeat that tactics 1-2 times per year. That is the only tactics I see towards dogecoin investment.
He barely does that once in a year or so, and for the most part of a year, dogecoin stays stable or goes sideways and even goes down sometimes if the market crashes, so I doubt if an investor can really get something out of it considering it has got no other element that can make it grow over time except for it to get hyped by Elon or the community sometimes.
I believe one should rather invest their money in something useful which can actually give them some value as time goes by instead of getting stuck with a token that is totally dependent on a celebrity at this point.