When someone says they're proud of you, it's a wonderful and encouraging expression of support and appreciation. Responding in a positive and gracious manner will further strengthen your relationship with that person. Here are some appropriate responses:
"Thank you so much! Your kind words mean a lot to me."
"I really appreciate your encouragement and support. It means a great deal to me."
"I couldn't have done it without your help and guidance. Thank you for being there for me."
"Your pride in me motivates me to keep pushing forward and striving for even greater things."
"I'm grateful to have people like you in my life who believe in me. Thank you for your faith in my abilities."
"It feels amazing to hear that you're proud of me. It makes all the effort worthwhile."
"Your support has been invaluable to me. Thank you for always being there for me."
"I'm so lucky to have such wonderful people like you cheering me on. Thank you for your kind words."
Remember, sincerity and a heartfelt response are key. Letting the person know that their encouragement matters to you and that you value their support will make them feel appreciated as well.