51k won in the jackpot! What's the best way to invest?

Hi, I recently won 51k in a jackpot and would like to invest 45k of it in Bitcoin.

Do you have any tips for me? Are there any strategies to get the best price in the long run?

I would like to hold the money on a ledger for 10-15 years.

But I want to make smart purchases and not buy everything directly at the current price.