There is no conclusion to your tai chi training as such; simply an ongoing exploration of existence, relationship, mind, body, balance, movement...
Nothing will be mastered.
You simply keep on training. Continue studying.
The passing of the years will bring you good health, martial skills (that require very little physical effort), calmness, insight, clarity, humour and humility.
You know that there is so much that you do not know.
You have the wisdom to see that the world is vast, and we are all so very small.
In quietude and obscurity you find an ample measure of peace, and realise that the journey was worth the effort.
You have gained extraordinary insights and enjoyed the mystery of it all.
The challenges and the obstacles were not impediments at all. They helped you to grow. They kept things interesting.