How do I increase my limit on Coinbase?

I'm trying to expand my investments in the cryptocurrency market, but I've hit a wall with my current limit on Coinbase. I've been exploring different options to increase it, but I'm not entirely sure how to proceed. Could you possibly guide me through the steps involved in raising my limit? I'm particularly interested in understanding the verification processes and any other factors that might affect the decision. Also, is there a specific timeframe I should be aware of for the increase to take effect? It would be great if you could provide some clarity on this matter.