How can I more adequately invest into crypto and stocks at 15

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I’ve been interested in finance for multiple years now, I’ve looked into custodial accounts and have set one up with my father. I initially invested $1,000 as a start up and it have raised to 3,000 now. From that gain I grew in confidence and found out that I could invest on cash app, I invested 1,200 on cash app and turned that into 3,000 currently but both accounts fluctuate. My main problem is that cash app limits my transactions at $400 per month making buying big stocks hard as well as the fact that i don’t want to keep giving my dad money to add to my custodial account. How can I invest better? My second question is how can I get into crypto? Since investing in the stock market I’ve gained a curiosity into cryptocurrency, I’m not very knowledgeable in the topic but I’m sure I can learn, currently all I can buy is bitcoin but my dad trades solana frequently and has made a good profiteering form what I know. Are there any places online that I can buy crypto without having to lie about my age?