Mining is deliberately designed to be intensively sourced and difficult so that the number of blocks found by miners every day remains constant. The individual blocks must contain a working document that can be considered valid.
The main objective of your mining is to ensure that the bitcoin nodes have access to a safe, force-resistant consensus. Mining is also the mechanism used to incorporate bitcoins into the system: miners, processing fees and "benefit payments" for newly created coins. Both serve to disseminate the new coin money in a distributed manner, as well as to encourage people to provide security for the system.