I feel it cannot be helped. There is no way one can cage the work we give to clients, because the moment we submit the work to them we have relinquished the ownership. In fact, if I am seeing my work stolen, it means I did a very good job.
I have groups on Facebook that I am a member of. I also have telegram groups and discords that have active writers that are willing to help one another grow.
I don’t have any writing work that I have at the moment. I don’t really think it is necessary to be writing down as the demands of every client is different. All I do is give them the specific date their work will be completed.
I have tried it before and it did not work for me. Social media needs a lot of work and attention, so if one is not ready to do the work it will be very hard to be consistent and have a portfolio on social media. I only show previous work that o have done to clients, I don’t use social media yet.
I have a template that I use for writing. Since I have a niche that I focus on, I just use them to write and edit to suit the needs of what I am writing about. So that is the tool I will say I make use of at the moment.