on the outside, i just performatively say thanks. or more often deprecate myself.

meanwhile i try to remember the compliment and collect it in my memory with other compliments. gradually, in no hurry, i try to accept that those compliments are given sincerely.

it's worked for me in some specific topics of compliments, like my language ability or certain other skills. I've learned to feel that others sincerely appreciate my contribution in those areas.

but more general compliments or affection from others... I'm still working on accepting.