can i become a grandmaster?
If you're 6 years old and decide to focus on chess for the next 10-15 years, you have good chances.
no. you dont. and you never will have a 'good' chance. there are more than 600 million active chess platers in the world. less than 2,000 are GMs. Do the math.
I am fairly certain the vast majority of these 600 million active chess players havent actually made a serious attempt at becoming grandmaster.
This Youtube channel is a good start
https://youtu.be/MX2CPtagz1g?si=KE67yBi9c9TYz67t
I dont think so, this is an unrated channel.
Lowrated chess players just naturally cant help as well as highrated ones.