I've heard that Bitcoin will finish mining in 2140, which is certainly a long way off. There's still a chance for us to continue dca BTC, as there's a strong possibility that in the future we'll see a higher BTC price than today, as BTC is constantly being mined, and we'll eventually see the BTC supply dwindle. Currently, I know there's only a small amount of unmined BTC left, approximately 1,100,000. While the number currently mined is 19,900,000, there's still time to accumulate BTC.
However, I'd like to know if there will be BTC miners once the supply is fully mined, and will the fees for sending from wallets to exchanges be high?
As long as Bitcoin exists, miners will validate transactions and will receive transaction fees even if there is no block reward, but whether it will be higher or lower will depend entirely on the congestion of the mempool at that time, as it is now.
I also wonder if the price fluctuations will be similar to the current bearish and bullish market.
Then there will be no more mining, so in my opinion, bitcoin's bull season and bear season can be managed with the activity of whales. I still have a lot of confusion about this.
Currently, BTC is widely traded, buying at a low price and selling at a high price. But will BTC trading be possible in the future, similar to daily trading? I think this is worth discussing...

I have no tension about trading Bitcoin because it will always exist because one day people will have to sell their Bitcoin, even if partially. Moreover, short-term traders will remain as they are now.