For a cheap start you can choose home assistant, you just need a raspberry pi. For a more commercial solution you can look at a platform like Homey (I am using this, it is more expensive but also more of an “out of the box” experience. In all cases before you decide check if the platform you step into supports the sensors and devices you have. This will mostly be the case but there can be exceptions that make the one platform a better altetnative then the other.
Home Automation
Home automation is the residential extension of building automation.
It is automation of the home, housework or household activity.
Home automation may include centralized control of lighting, HVAC (heating, ventilation and air conditioning), appliances, security locks of gates and doors and other systems, to provide improved convenience, comfort, energy efficiency and security.
Warning: Working with electricity can result in injury, property damage, or even death if it is not done properly. Please keep this in mind while assisting others. If you are not sure about what you are doing, hire a licensed professional.
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I kept mine simple and used a smartthings hub to handle my zigbee needs and make up for Alexa's shortcomings. Those two really do complement each other will, especially when you discover the usefulness of virtually switches and sensors (particularly a virtual Alexa by, which operates as a switch but behaves like a sensor, so you can trigger Alexa to do things from outside of Alexa)