One of the main challenges is the transaction processing capacity. Currently, the Bitcoin network can handle a limited number of transactions per second
But isn't it now some way better than it was back then, i don't think scalability should be a thing of problem anymore like before when theres bitcoin lightning network that deals and handles such, in case you don't know.
This limitation has led to the development of solutions like the Lightning Network, which aims to improve scalability by enabling faster and cheaper off-chain transactions.
you're just taking yourself a bit backward on what has already been dealt with, almost eevryone knows about this, then why bringing it up again, thortology?.
Another challenge is the environmental impact of Bitcoin mining.
Bitcoin is not environmentally unfriendly on us, read more from this.
debunking bitcoin energy in mining bitcoin by fillippone
https://bitcointalk.org/index.php?topic=5325350.msg56613804#msg56613804