There are many best gifts that can be given to mentors because they have great services in teaching us. Generally, trading mentors don't expect anything other than the payment they set when we want to learn trading, but as a form of gratitude even though we pay them there are times when we give something more which will make our relationship with them stronger.
Yes, payments are more than enough for the service that they offer. If there are legitimate trading mentors and you've been able to take all of their teachings then all up to you.
Can be additional payment, a token of appreciation like mugs, cap, etc.
Those simple things will be appreciated by them. Because a real mentor makes a lot of money from trading itself and they can buy everything unless they're just plain mentors that do not trade at all.
Appreciation can be done by doing many things and I think showing respect to a mentor is enough. But if we want to do something more than that, maybe one of the things I would do is to give a gift to his family. If a mentor already has a child, it's great to give the child a gift. Even though it's not much, it's a form of appreciation for the mentor through their child.
What I see from my experience when I have a mentor, they will be very happy when we as "students" give more attention to their family, one of which is their child.
Because for me when someone gives us knowledge guidance, there is nothing more valuable than the knowledge they give, including knowledge in trading.