Exactly this 👆👆 When I joined my punk band, we had a lot of covers in the set, even though we wanted to be an originals band. We kept them going for a wee while while we added originals to lengthen our set to a minimum of 45 minutes, but now that we're there, most of the covers are on death row. We're keeping two that really chime with our vibe but the rest will go as we get new originals gig-ready.
We might add two or three I - IV - V three-chord bangers to rotate as encores, but they won't be part of the main set. As we lengthen our set to 60 and then 90 minutes, they'll all be originals unless a cover really gels with us.
Get out there, get started and then shape things in the direction you want to go.