I want to earn the money of an escort, but I don't want to do full service (FS) anymore. Is that possible?
Yes. In fact, many escorts are putting themselves through college or bringing themselves out of financial difficulty without providing full service. They provide services such as sensual massages with a "happy ending" finish that does not involve actual sex, or simple "dinner and masturbate" sessions. There are many, many clients who are interested in this type of service. In fact, all clients will pay for a good, non-FS session, but there are many clients only interested in non-FS sessions who will never pay for a full service session. In other words, you aren't really losing any clients by providing non-FS sessions. You will also find out that most of your clients are interested in just the companionship of meeting another woman.
Another smart method is to say you don't offer full service, but when your clients show up, you can filter out the good ones from the bad ones and provide full service to only the good ones. Then you can have the best of both worlds!