If you had to invest $6,000 a month in a stock, which one would you choose?

Got a job... Left with around 9k every month to play around with.. Precovid, I've turned 40k into 500k buying electric, energy stock.. Never sold, now my Investment is like near 0.. However, I've been stacking my money up again for the last few years.. Got a couple 100 thousands in checking looking pretty every month, but theres no Interest except money just stacking.. I think its time for me to invest it in a safe stock. I'm not looking to get rich quick.. I am just looking to grow my account slowly.. Basically just adding Into it every month.. Thanks.