This is a very common question I get and it’s not the easiest to answer but in short: If you want to be endorsed by a guitar brand or any gear brand in particular you have to have something that is valuable for the brand. It could be several things such as being a touring artist. That means being out touring and playing in front of a lot of people showing the gear in particular being used live. You can have a great following online, meaning you have a lot of people who value what you say or recommend. Do you have a blog, social media site with tons of visitors? Marketing competence? It all comes down to; how can you make money for the brand. Understanding this will definitely help you in your quest.
I consider every endorsement deal being a business partnership or relationship. I see it as me being employed by the brand in question, and I try to contribute in every way I can, video demoing, strategic planning, touring exposure, social media exposure, clinics/events etc. It’s not like I’m getting endorsed and just go laugh in my room with all the free shit I’m getting, I’m working hard to return the favor. Make yourself invaluable!