How to say 'I think' in different ways

Stronger

• I Believe
• I'm convinced
• The way I see it
• If you ask me
• In my opinion
• From my point of view
• From my perspective
• As far as I'm concerned

Weaker

• I guess
• I suppose
• As far as I know
• As far as I can tell
• To the best of my knowledge
• Based on my assessment
• If I'm not mistaken
• I would say