Your workload has become challenging. Instead of trying to handle additional responsibilities by yourself, ask for help. If you continue to forge ahead with no complaint, your employer will assume you don't have enough on your plate. Nothing could be further from the truth. A good way to illustrate how many tasks you perform is to take some annual leave. When everything grinds to a halt in your absence, you'll be treated with more respect. Have you been looking for a job? You can find one involving property management.