beside teaching what else can i do

I have a spouse visa for japan.
I have over 25 years in senior management including GM and CEO roles.
Issue I have no degree,i have worked my way up the hard way.
What type of job could i get in japan?
I know teaching is an option, as i have offers there already but looking for something a little more, challenging.
I work in the water sector, currently delivering operational efficiency and intelligent water solutions for clients.
I also have 1100 contacts globally in the water industry
Thank you in advance

I assume you have a visa as spouse of a Japanese national, right? In that case you can work as anything where you find a job. The issue of needing a degree does not apply. So if you have all that experience then look for a job in your field. Or any other field you think that you could reasonably work in.

I guess you are new to Japan. When I first came also most Japanese assumed that I would look for a teaching position. Simply because I am a western foreigner. I had (and have) no teaching experience whatsoever. But it is totally possible to work in your old industry. Specially if you find a company that is internationally interested/focused.

In my case it was actually super easy. I had my profile on LinkedIn and one day got an email from a Japanese company, asking if Ifd like to interview with them. Now I might have a very specific skill set that is attractive to Japanese companies, but you also have a lot of experience and just need to sell it. Like in any other country where you are we and need to find a job.

Good luck job hunting!

If you have "1100 contacts globally in the water industry" you should be attractive to one of the larger consulting companies that have an office in Japan.
The only observation I might make is that being a GM/CEO doesn't necessarily mean you would make a good consultant as the skill sets are different. But, as you said, you worked to that position, so you'll need to go back a few steps. Also, people will tell you you're over-qualified for interesting but lower level jobs which can be frustrating.

I have over 25 years in senior management

How is your Japanese? Are you fluent? In Australia, could you work on such positions without speaking English like a native? Can you imagine doing same jobs in Japan without speaking Japanese? In a complete Japanese work environment with people who only speak Japanese?

Ask yourself those questions because someone in Japan will probably ask you the same questions.

To be fair about the talking/reading/writing Japanese question/comment, it certainly helps and in most cases is necessary.

There are some exceptions: One of my previous colleagues was a corporate banker and was posted to Tokyo for three years - back in the 1980's. He had a great time (on an expense account), but during his three years he couldn't speak any Japanese - he didn't need to, so never bothered to learn. I guess he had someone with him as a translator most of the time, and probably only knew a few words even after three years of living here.

My husband had a posting in Tokyo where he was the CEO for several years in the 1990's. Admittedly it was an offshore company with a smaller office in Japan. Despite all his best intentions he couldn't really communicate in Japanese, but had a Japanese manager who spoke good English, so all the business dealing were conducted bilingually between my husband and this manager. It worked out fine. He could understand a lot by listening.

In certain situations Japanese fluency is not essential. May I also add he didn't have a degree either, but had years and years of experience in his profession.