There are too few people to handle cases, and the senior does not understand Infra Solution (the senior has been in the IT industry for about 20 years, but has never been exposed to Infra. I have taught him about it in a short period of time, but he still cannot handle a case completely), which has led to a huge increase in my workload, and I cannot handle the existing workload. Moreover, the salary is at a relatively low level, and the salary increase is very small.