Dogecoin will be the best you can invest $40,000 in this season and have something favourable to achieve that will make you a billionaire in the society, because the price of dogecoin is too low in the market which will help you to purchase a huge amount of dogecoin in the market and hold. I will advise you to apply long term hodling in your cryptocurrency investment because many investors that used this strategies to became a billionaire in the society always paid attention to the market price. I believe, if you can hold Dogecoin like 3 years, I think it will definitely bring you a good results at the end of your investment.