No manicure/pedicure option?

You need to reach level 6 of the wellness skill.

To launch your own nail business, your Sim will need to spend some time building the Wellness skill. You won’t be able to offer nail services until your Sim has level 6 Wellness skill. Once your Sim is at level 6 of the Wellness skill, they can click on a spa chair and select Tend Spa Chair, much the same way your Sims can tend a bar.

While tending a spa chair, your Sim will wait near the chair until nearby Sims wander over to request spa services. Your Sims will automatically offer manicures, pedicures, hand massages, and foot massages while tending a spa chair but if you only want your Sim to do nails or massages, you can disable any services you don’t want your Sim to offer via the spa chair as well.

If your Sim completes the new Self-Care Specialist aspiration, they will earn the Self-Care Expertise reward trait which will allow them to make a lot more money from offering all spa services, including nails! This can be a very lucrative option for your Sims!

https://simscommunity.info/2021/09/07/the-sims-4-spa-day-refresh-all-about-nails/

"simgirl1010;c-17974206" wrote:

If your Sim completes the new Self-Care Specialist aspiration, they will earn the Self-Care Expertise reward trait which will allow them to make a lot more money from offering all spa services, including nails! This can be a very lucrative option for your Sims!

I can't complete the aspiration because the money my sim earned by wellness doesn't count.

But nevertheless it's easy to make money with wellness. For example when you are teaching a yoga class you get 110$ per participant. So with 2 yoga classes with 4 participant each you earn 880$ a day. The better your wellnessskill the more expensive massages you can give. Your sim should work on a massage table and not on a massage chair.
If you work in a spa in the beginning you don't have buy any wellness stuff to earn money .
Manicure or pedicure is not so good paid but when the customer is satisfied you get a tip.
Earning 1000$ a day is really easy and by doing all that wellness your sim increases the wellness skill and is able to earn much more money.