Hi and welcome to the forum
I use a tool called Tubebuddy. It is free and will help you find keywords and search-phrases. To get more exposure to your channel working with SEO is one of the best (free) ways so start working on that from day one
I also suggest you share your videos on your social media (I take it you do that already) but maybe look for new ones like Reddit etc. One of the ways I have gained more exposure is to collab with bigger channels in the same niche so try and reach out to others too.. this can take some time though!
welcome once again, and best of luck with your channel