1. See everything (that you have currently managed, and see what else you wish to push to notice next)
If you notice it, then you'll use it. This gives an appearance of making choices, when the reality is that you've increased the amount of what you get point out. You can use everything; this will be either internally or explicitly. You get to directly reference what you have observed, heard or felt in response in the scene, or you can internalise these. It depends what it is, but you will seem bold as a performer.
No one is ever aware of everything. It's fundamentally why improv is endless. There's no end to what you could be aware of and you'll never be always aware of the same stuff. Do what you do, seek to notice more.
Bold by using it. This defeats the problem mentioned in the introduction, boldness is not being brutal in performance approach. A gentle improviser may be more open; a careful improviser will access more that is around them and inside themselves. These make you bolder, as you have more to use.
2. Trust yourself
The only difference between experienced and beginner is trust and confidence in themselves and others. This means that you must find a place in yourself where you know you can do all what you want to do now. To use a Razowski-ism, if you know you want something, you have already found it.
You are enough. You can do all you want to do currently, the way that you know it. I have left people to do what they do, and it turns out interesting. I would not say that it suits me, but I am clogged up with experiences in improv and theatre - it seems illogical in design what they wanted to do. However, if people want to be self-taught, it is important to stay out their way (to some extent). This exclaims that you will do what you do, but the best effect from it comes from trusting that you will deliver what you want to. You are all you need to be to perform your improv.
3. Use sustainable physicality
The connotation about being bold brings up physical presence onstage. If you are comfortable in yourself, then you will hold stage presence anyway. However, in characters, you get to use a physicality that distinguishes one person you find from another.
When finding these characters, being open to exactly what you do will enable the character to be defined. Each character needs to be sustainable. You must be able to keep this going. I remember an early performance of my own back in 2008 where I explored the essence of Decon opening in a highly-structured and silly longform format, ‘The Flurry of Florence’. It was theatre with set, props and two actors. In the premiere of the production, I did not find a sustainable voice; I think the character I was going to be started Australian (I don’t promote using accents). The accent disappeared. Lets not let your characters drop; if you physicalise something, stick with it. A person is who they are through how they are.
4. Have a specific (and personally memorable) voice
This is alike the last, but on vocally finding your character. Obviously, as the anecdote in the last one determines, it must be sustainable. However, more importantly, it must hold details within it. Notice the specific elements of what you are doing. If you are not a voice person, don’t try to be. Maybe one day you will be, but the voice a character has needs to be personally memorable. Be in the right show for this to work for you, too.
The show you choose to be in will ask certain stuff from you. A person with a bad back, should not be in a physical theatre piece, and a person with less voice capabilities should not do a set that asks them to create through a wide vocal change.
5. Try out performing like someone else would - get away from your own defaults and nail down how someone else would adopt a persona
On the contrary, we do not want improvisers staying safe, as that makes your improv pointless. It was McDermott that said (in person, no reference to when) that improv requires risk, otherwise the purpose of using improvisation is lost. Just devise or write, in which case. We all have defaults we go to in improv, either consciously (I hope not) and subconsciously. Don’t be safe, take the risks that makes the theatre feel alive and present with this audience.
You can perform like someone else. Not for a set, but for a character, improvise like someone else would. Adopt a persona of them performing this character you are finding. It will break the boundaries of how you perform; it would also ensure that, through total embodiment, you will achieve something vastly different that usual.