Make yourself visible to them and make yourself helpful for their type of leadership style. But if you don’t work on projects relevant to them and/or briefings they don’t know you exist. Ask for work for the senior leader, do a great job, AND help the senior leader (then they’ll realize your value and want you along). I’m a senior leader and I love folks that give me a recommendation, are articulate and summarize things, can answer questions and are go getters that can anticipate talking points and materials I need. GS level doesn’t matter but they need to be in my orbit for me to know about them as I don’t have time to go looking for advisors.