Great absolute clarity on what is expected of you by your manager. Tech lead roles have a mix of manager-light bits and your manager may have very specific ideas as to what the role ‘looks like’ or ‘feels like’. You need that info to succeed.
So understand your own manager's approach to management, and make sure you're aligned with it. Recently I was in a job where my own "servant leadership" style clashed quite badly with my boss, who was much more focussed on management "driving delivery" of projects. It did not end well.