SEO issue, Duplicate content and URL modified

[RRJJ]

Hi Guys, recently I am get into know some seo knowledge and found that the URL rule of Shopify is not friendly for SEO

I just found a way for the solution: https://community.shopify.com/c/Shopify-Discussion/Duplicate-Content-Same-Page-with-different-url/td...

But I have some questions about this way.

My website already running about 2 years, is it OK to follow the instructions in the link?

I am afraid if I change the URL rule, would I lose some rank and organic traffic? Hope some Shopify SEO experts could help me.

Please let me what influence will have

Thanks!