I'm interested in having the highest level of anonymity as our privacy apparently only keeps fading away. The best and only way I know about is by using the Tor network, but I only know how to use the Tor browser. Is there a way I can use Tor for everything on my PC, just like a VPN?
Tor is the easiest solution. But you can go a step further. Use tor when using a public WLAN, or a prepaid sim-card, if you can buy those anonymically in your country, then even if someone cracks your tor connection all they would get is the public WLAN or prepaid phone location, and maybe your computers wlan-chip serial number.
If you use tails-linux booted from a USB stick, all your internet traffic goes through tor. Tails is good, but sometimes it has programs that are not completely up to date.
Even tor is not 100% secure. SIlk-road boss was caught even though he used tor, that happened because he was too big a criminal. Enough resources were made available to track him and they succeeded. He was not careful enough.
If your goal is not to let people trace you and find what you're doing with your bitcoins then you could simply use mixers (ChipMixer) or privacy-focused wallets like Wasabi.
The solution in that case is to buy ProtonVPN and connect to servers that use the Tor network
Mixers are not completely anonymous any longer. sometimes coins can be tracked even through mixers.
I don't know about ProtonVPN, but some VPN services save trafic-data and give it to authorities if required. It safer to use VPN+tor rather than just VPN.