Oh I've been saying that for 2 years! Once I have this, this and this and done that training that's it. It never is! Lol! Always something new or clients say "do you do this?" It makes you think but its true you need to ask yourself about the boat. I've booked a waxing course and I don't think its not going to make my boat go any faster but I'll go now its booked. I have had 2 people ask me today to start massage. I just can't keep up!
How many people are asking you for treatments before you decide to train in it? I get asked every week if I do eyebrows and lashes, but I specialise in nails, I'd much rather team up with another specialist for cross promotion on the things that I don't offer than invest in training for something else that's not really my thing just now. I did my lash training and hated it so that was a waste of time, for me and a lesson learned. Never say never, I might well decide to introduce new services at some time in the future but I love what I do and don't offer treatments I don't love.
Massage isn't just a quick course, you really need to know your stuff and you have lots of skills to perfect already, why add to it? How about looking at your treatments and thinking about how you can make these better first? I have a list about 10 pages long of things I'm doing to improve my business over the next year and that's just specialising in one thing - more than that would be more than I could take on and do professionally.