Meaningful thanks and greatness are two things worth exploring further.
The next time someone says thank you, tells you that you are wonderful and you have helped them immensely, just let that filter right into your system and be banked into your heart space.
They do mean it.
Make sure you don't brush it off, it's a little gift for your soul - so please gently, let it right in.
Be ok with hearing that you are great, be ok with the thanks - make peace with these things.
If you are running around wishing you were more successful, but you won't let anyone tell you that you are good, you have resistance.
If you wish to, you could sit with this and examine it, sending it love until it feels more workable or completely disappears.
You are great. Your greatness is apparent to others, and you can reap rewards from it far more effectively if you work with it, rather than deny it or actively refusing to see it.
And always, when you say thanks - say it right into the heart of the person you are speaking to. It's magical. <3