On a side note, Raspberry Pi (and even CPU/GPU/FPGA) aren't suitable for mining Bitcoin and you won't get any profit. For comparison (according to https://cryptoticker.io/en/bitcoin-mining-raspberry-pi/), Raspberry Pi only have 30 H/s while ASIC (such as AntMiner S19) have 95 TH/s.
[2021-02-16 06:32:43] Loaded configuration file /home/angel/.cgminer/cgminer.conf
[2021-02-16 06:32:43] Error in configuration file, partially loaded.
[2021-02-16 06:32:43] Start cgminer with -T to see what failed to load.
[2021-02-16 06:32:43] No devices detected!
These are the actual problem,
1. Your cgminer.conf is corrupted or you make invalid configuration. Follow the instruction (start cgminer with -T parameter to see) to see the problem.
2. CGMiner can't detect any device suitable for mining