New player is looking for some guidance

I’m new in crypto market but trying to learn and catch up rapidly.

I plan to invest on long term for holding.

My question would be relative….strange to many I think. (It sounds strange to me but interested how you all think about it).

I had the idea to build up my portfolio by spending 100-200$ weekly with something like this:

For every $100 I would buy:

• $50 BTC
• $30 ETH
• $20 SOL

Otherwise if this is not a valid idea I would just invest in either BTC due to obvious reasons, or SOL becase it’s still in that affordable range however I’m unsure how this slow build up would work out.