i can also add a few:

1. buy bitcoin not as a short term plan but as an untouched investment
2. if you have cold keys, store it in a secure place where you can easily find it
3. have an emergency money so you don't have to touch your untouched investment
4. always leave options so you can be flexible most of the time.

investing isn't all investing if all you don't have spare cash for emergency or for savings. you don't know what will happen in the future not only in crypto but in real life, it's better to be safe than sorry.