What should I (26M) do about my feelings for my best friend (25F)

r/

I have known her for 4 years – originally back in our home country but only as a colleague, and then I moved countries 2 years ago and she also moved 1.5 years ago

We’ve been getting very close since then – I would say we are very compatible and have a lot of banter and fun; nothing physical has happened except for occasional cuddling

I have recently started developing feelings for her but I dont know how or if to tell her – I dont want to lose our friendship but I also dont want to regret not exploring this

TL;DR How should I tell my best friend i like her without ruining our friendship?