If i was able to buy 10 houses from 300k$, i would rent them for 1k$each. 10k$/month is a nice income, plus you don't have to do anything.
Jokes aside, it is way more important to have skills and bright ideas to make money rather than having money. There are many people with lots of money and they don't have an idea what to do with them.
I wish i had mad coding skills and full of bright ideas rather than having money.
Having enough funding, i would stablish an electronics store offering electronics parts sales and repair of consumer electronics appliances. I will not invest my money with dead investments i will make sure that i can run a business with my enough funds so that in the future when the business grows it will earn its profit and will plan for additional business which is an internet shop which i am also knowledgeable with running the set-up of hardware and software. That kind of thinking is what i believe the right thing to do with the funds you have.