u/Icy_Bend662

I would like some advice from people who are more experienced in the stock market.
I want to make 40K to help with the down payment on my house.

I currently have 5K invested in:
AMPX, RGTI, CRDO, RKLB, Oracle, AEVA,OKLO (
I started with 3.5K ) I made a 60% return on AMPX but I had little money invested.

What is the most rational approach to build more money with a small investment?(I plan to keep adding more money little by little, but I can only contribute a maximum of around $300 per month.)
Should I concentrate more money into fewer stocks to maximize gains when they go up, or diversify more to avoid big losses and make smaller gains?