If you hold a large sum of bitcoin is better to hold for a higher price. As i read you think bitcoin will go over 300k$ , but in my opinion it can reach that so soon, i think it can go to that value starting from 2025 not before, and this depends from some factors, how much will electricity will be needed , and how new miners will work then.
Besides the wait might come to end by next year so keep your guard , it will be a big lose if you sell it by now.