in my view & from my point of view
You can replace "in my opinion" with any of these expressions:
IN my view,
FROM my point of view,
Just be careful not to mix these two, or use them incorrectly!
IN MY VIEW-examples:
https://youglish.com/getbyid/105928496/in%20my%20view/english
https://youglish.com/getbyid/77978390/in%20my%20view/english
https://youglish.com/getbyid/81118378/in%20my%20view/english
https://youglish.com/getbyid/32189374/in%20my%20view/english
https://youglish.com/getbyid/32202111/in%20my%20view/english
https://youglish.com/getbyid/22751470/in%20my%20view/english
https://sites.google.com/view/speaking-discoursemarkers/discourse-markers/in-my-view
FROM MY POINT OF VIEW-examples
https://youglish.com/getbyid/26090113/from%20my%20point%20of%20view/english
https://youglish.com/getbyid/23711795/from%20my%20point%20of%20view/english
https://youglish.com/getbyid/22754887/from%20my%20point%20of%20view/english
https://youglish.com/getbyid/34171496/from%20my%20point%20of%20view/english
https://youglish.com/getbyid/67817744/from%20my%20point%20of%20view/english
https://youglish.com/getbyid/66618605/from%20my%20point%20of%20view/english
More ways of expressing your opinion(s): https://sites.google.com/view/speaking-discoursemarkers/production#h.prxcx6ms0ovc