19 and Need Advice!

So I'm currently 19 and trying to build my long term investment portfolio. I put roughly 40$ in 13 different stocks which equals 520$ a month into each stock. I'm here to ask if this is a good strategy or if i should make my list shorter to get a little more concentrated. This is the list I have made and I invest on the 15th of every month. I also am investing in my ROTH IRA and am going 80% VTI and 20% VXUS.

1. SPY
2. ARKK
3. TSLA
4. AAPL
5. META
6. MSFT
7. GOOG
8. NVDA
9. AMZN
10. AMD
11. COST
12. KO
13. VZ

Will Upvote!!!

Thank you guys!