Here are the smart dimming switches we recommend based on your answers:
Smart Dimming Switch Recommendations
These all require a smart home hub with Z-Wave capabilities. I prefer to use Home Assistant with this Z-Wave USB stick (which also does Zigbee), but there are many other smart home hub options. The Step-up pick below also has a vacancy/occupancy sensor. If you want to keep your existing switch you can use a Z-Wave microswitch like the Zooz Dimmer relay. It installs behind your existing wall switch.
Preview
Budget Pick 
HomeTechHacker Recommended 
Step-up Pick 
Product Name
Enbrighten Z-Wave Light Dimmer Switch, QuickFit & SimpleWire, 3-Way Ready, Alexa & Google Assistant Compatible, Hub Required, Repeater, White & Almond, 700 Series (58438)
Zooz 800 Series Z-Wave Long Range S2 Dimmer Switch ZEN77 800LR, White | Simple Direct 3-Way and 4-Way Solution (Works with Regular Switches, No Aux Switch Needed) | Z-Wave Hub Required
Enbrighten Z-Wave Smart Motion Sensor Light Indoor, On/Off, Vacancy/Occupancy Sensor, Includes White & Almond, Zwave Hub Required, Works with SmartThings, Wink, & Alexa, Smart Light Switch, 26931
Current Price
$42.99
$46.95
$54.38
Details
Budget Pick
Preview
Product Name
Enbrighten Z-Wave Light Dimmer Switch, QuickFit & SimpleWire, 3-Way Ready, Alexa & Google Assistant Compatible, Hub Required, Repeater, White & Almond, 700 Series (58438)
Current Price
$42.99
Details
HomeTechHacker Recommended
Preview
Product Name
Zooz 800 Series Z-Wave Long Range S2 Dimmer Switch ZEN77 800LR, White | Simple Direct 3-Way and 4-Way Solution (Works with Regular Switches, No Aux Switch Needed) | Z-Wave Hub Required
Current Price
$46.95
Details
Step-up Pick
Preview
Product Name
Enbrighten Z-Wave Smart Motion Sensor Light Indoor, On/Off, Vacancy/Occupancy Sensor, Includes White & Almond, Zwave Hub Required, Works with SmartThings, Wink, & Alexa, Smart Light Switch, 26931
Current Price
$54.38
Details
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