"plenty of opportunities" is a valid phrase in written English. It can be used in any written context to refer to a great number of opportunites available. For example: There are plenty of opportunities to travel the world after graduating.
We had plenty of opportunities.
There are plenty of opportunities for graft.
"There are plenty of opportunities.
"There'll be plenty of opportunities.
"I thought I missed plenty of opportunities.
"We had plenty of opportunities to score".
Manning had plenty of opportunities to buckle along the way.
Ludwig does not simply clarify my doubts with English writing, it enlightens my writing with new possibilities
Simone Ivan Conte
Software Engineer at Adobe, UK