optimize server

I am looking for someone with technical experience to help with a project that requires optimization of a server using ZABBIX software. The project does not include the need for multiple servers, just one, with optimization focusing on performance improvement. The server is currently running on Docker with Posgresql. Around 2,000 hosts with a projection of 25,000. The symptoms it presents are slow queries, high server processes, etc. Please see the attached files. If you have enough knowledge to improve it. send me a message immediately because the situation is urgent