If you provide scheduled services, you can add a scheduler to your website so people can book themselves and even pay ahead of time if you wish. (Some website builders have something like this built in.)

Most of these will include options like the ability to force a break between appointments (of whatever length you want); integrate with your existing calendar (so you can easily block off times when needed by putting something on your own calendar); send email / text reminders, etc. Here are a number of options to consider:
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https://www.calendly.com
https://www.bodyworkbuddy.com
https://www.gettimely.com
https://www.thryv.com
https://www.timetap.com
https://www.setmore.com
https://www.timecenter.com